{"title":"Campbell Miscellaneous Valves","description":"\u003cstyle\u003e\n.cm-wrap{font-family:Arial,Helvetica,sans-serif;color:#1a1a1e;background:#E1E3E6;padding:0;margin:0 -20px;line-height:1.55}\n.cm-wrap *{box-sizing:border-box}\n.cm-crumb{background:#fff;padding:10px 28px;font-size:12px;color:#9B9EA3;border-bottom:1px solid #C7CBD1;text-transform:uppercase;letter-spacing:1px}\n.cm-crumb a{color:#4A4A4F;text-decoration:none;font-family:\"Arial Black\",Arial,sans-serif}\n.cm-crumb a:hover{color:#B3122A}\n.cm-hero{background:#4A4A4F;color:#fff;padding:56px 32px;border-bottom:6px solid #B3122A;margin:0}\n.cm-hero-inner{max-width:1180px;margin:0 auto;display:grid;grid-template-columns:1.2fr 1fr;gap:40px;align-items:center}\n.cm-hero h1{font-family:\"Arial Black\",Arial,sans-serif;font-size:38px;line-height:1.1;margin:0 0 14px;letter-spacing:.3px;text-transform:uppercase}\n.cm-hero h1 span{color:#B3122A;display:block;margin-top:6px;font-size:21px;letter-spacing:1.5px}\n.cm-hero 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strong{color:#4A4A4F;font-family:\"Arial Black\",Arial,sans-serif}\n.cm-final{background:#B3122A;color:#fff;padding:48px 32px;text-align:center;margin:0}\n.cm-final h2{font-family:\"Arial Black\",Arial,sans-serif;font-size:30px;text-transform:uppercase;margin:0 0 12px;letter-spacing:.5px;color:#fff}\n.cm-final p{font-size:16px;margin:0 0 24px;max-width:680px;margin-left:auto;margin-right:auto;color:#fff}\n.cm-final .cm-phone{font-family:\"Arial Black\",Arial,sans-serif;font-size:26px;color:#fff;letter-spacing:1px;display:block;margin-bottom:12px}\n.cm-foot{text-align:center;padding:22px;font-size:11px;color:#9B9EA3;background:#E1E3E6;line-height:1.7}\n@media(max-width:780px){.cm-hero-inner{grid-template-columns:1fr;gap:24px;text-align:center}.cm-hero .cm-cta-row{justify-content:center}.cm-hero-stats{margin-top:8px}}\n@media(max-width:640px){.cm-hero h1{font-size:26px}.cm-hero h1 span{font-size:16px}.cm-hero{padding:36px 20px}.cm-section,.cm-section.alt{padding:32px 18px}.cm-h2{font-size:20px}.cm-fam-card h3{font-size:17px}.cm-final h2{font-size:22px}.cm-pe-block{padding:36px 20px}.cm-final .cm-phone{font-size:22px}.cm-hs-num{font-size:22px}}\n\u003c\/style\u003e\n\u003cdiv class=\"cm-wrap\"\u003e\n\n\u003cdiv class=\"cm-crumb\"\u003e\n\u003ca href=\"\/collections\/all\"\u003eCatalog\u003c\/a\u003e › \u003ca href=\"\/collections\/campbell\"\u003eCampbell\u003c\/a\u003e › Miscellaneous Valves\u003c\/div\u003e\n\n\u003csection class=\"cm-hero\"\u003e\n\u003cdiv class=\"cm-hero-inner\"\u003e\n\u003cdiv class=\"cm-hero-text\"\u003e\n\u003cspan class=\"cm-tag\"\u003eRelief · Float · Snifter · Bleeder Orifice\u003c\/span\u003e\n\u003ch1\u003eMiscellaneous Valves\u003cspan\u003ePressure Relief · Tank Float · Snifter · Bleeder · Specialty\u003c\/span\u003e\n\u003c\/h1\u003e\n\u003cp class=\"cm-sub\"\u003ePressure relief valves in 75 PSI and 100 PSI ratings, lead-free brass and stainless. Tank float valves for cisterns and storage tanks. Snifter valves and bleeder orifices for galvanized hydropneumatic tanks. The system-protection and air-management hardware that backs up every well install.\u003c\/p\u003e\n\u003cdiv class=\"cm-cta-row\"\u003e\n\u003ca href=\"mailto:sales@watermainsupply.com\" class=\"cm-btn\"\u003eRequest a Quote\u003c\/a\u003e\n\u003ca href=\"tel:2816648000\" class=\"cm-btn-out\"\u003eCall 281.664.8000\u003c\/a\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"cm-hero-stats\"\u003e\n\u003cdiv class=\"cm-hs-item\"\u003e\n\u003cdiv class=\"cm-hs-num\"\u003e2\u003c\/div\u003e\n\u003cdiv class=\"cm-hs-lbl\"\u003eRelief Pressures\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"cm-hs-item\"\u003e\n\u003cdiv class=\"cm-hs-num\"\u003eLF + SS\u003c\/div\u003e\n\u003cdiv class=\"cm-hs-lbl\"\u003eMaterial Options\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"cm-hs-item\"\u003e\n\u003cdiv class=\"cm-hs-num\"\u003e12\"\u003c\/div\u003e\n\u003cdiv class=\"cm-hs-lbl\"\u003eTank Float Diameter\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"cm-hs-item\"\u003e\n\u003cdiv class=\"cm-hs-num\"\u003e60+\u003c\/div\u003e\n\u003cdiv class=\"cm-hs-lbl\"\u003eCatalog SKUs\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/section\u003e\n\n\u003csection class=\"cm-section\"\u003e\n\u003ch2 class=\"cm-h2\"\u003eSpecialty Valve Categories\u003c\/h2\u003e\n\u003cp class=\"cm-sub-text\"\u003eFour categories cover the auxiliary valves that protect, regulate, and balance every pump system. Skip these and the system either over-pressurizes, runs dry, or loses its air cushion.\u003c\/p\u003e\n\u003cdiv class=\"cm-fam-grid\"\u003e\n\n\u003cdiv class=\"cm-fam-card\"\u003e\n\u003cdiv class=\"cm-fam-body\"\u003e\n\u003ch3\u003ePressure Relief Valves (RV)\u003c\/h3\u003e\n\u003cp class=\"cm-tagline\"\u003e75 PSI \u0026amp; 100 PSI · LF and Stainless\u003c\/p\u003e\n\u003cp class=\"cm-desc\"\u003ePressure relief valves protect the system from over-pressurization — pump runaway, switch failure, thermal expansion. RV2NLF (1\/2 in) and RV3NLF (3\/4 in) at 75 PSI standard. RV2N100-LF and RV3N100-LF at 100 PSI for higher-pressure systems. Stainless variants (RV2TSS, RV3TSS, RV2N100SS, RV3N100SS) for aggressive water chemistry. Always specified on bladder tank installs.\u003c\/p\u003e\n\u003cdiv class=\"cm-spec-row\"\u003e\n\u003cspan class=\"cm-spec-label\"\u003e75 PSI Brass LF\u003c\/span\u003e\u003cspan class=\"cm-spec-val\"\u003eRV2NLF, RV3NLF\u003c\/span\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"cm-spec-row\"\u003e\n\u003cspan class=\"cm-spec-label\"\u003e100 PSI Brass LF\u003c\/span\u003e\u003cspan class=\"cm-spec-val\"\u003eRV2N100-LF, RV3N100-LF\u003c\/span\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"cm-spec-row\"\u003e\n\u003cspan class=\"cm-spec-label\"\u003e75 PSI Stainless\u003c\/span\u003e\u003cspan class=\"cm-spec-val\"\u003eRV2TSS, RV3TSS\u003c\/span\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"cm-spec-row\"\u003e\n\u003cspan class=\"cm-spec-label\"\u003e100 PSI Stainless\u003c\/span\u003e\u003cspan class=\"cm-spec-val\"\u003eRV2N100SS, RV3N100SS\u003c\/span\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\n\u003cdiv class=\"cm-fam-card\"\u003e\n\u003cdiv class=\"cm-fam-body\"\u003e\n\u003ch3\u003eTank Float Valves (TFV)\u003c\/h3\u003e\n\u003cp class=\"cm-tagline\"\u003eStorage Tanks · Cisterns · Float-Actuated Fill\u003c\/p\u003e\n\u003cp class=\"cm-desc\"\u003eMechanical float valves for filling cisterns, storage tanks, and livestock troughs. TFV-1LF complete assembled lead-free unit. TFV-KLF unassembled kit for custom installs. TFVLF float valve only (mounts to your existing rod). TF12 hard-rubber 12 in float for larger storage tanks. Closes off inlet supply when tank reaches set level — no electricity required.\u003c\/p\u003e\n\u003cdiv class=\"cm-spec-row\"\u003e\n\u003cspan class=\"cm-spec-label\"\u003eAssembled\u003c\/span\u003e\u003cspan class=\"cm-spec-val\"\u003eTFV-1LF\u003c\/span\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"cm-spec-row\"\u003e\n\u003cspan class=\"cm-spec-label\"\u003eUnassembled Kit\u003c\/span\u003e\u003cspan class=\"cm-spec-val\"\u003eTFV-KLF\u003c\/span\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"cm-spec-row\"\u003e\n\u003cspan class=\"cm-spec-label\"\u003eValve Only\u003c\/span\u003e\u003cspan class=\"cm-spec-val\"\u003eTFVLF\u003c\/span\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"cm-spec-row\"\u003e\n\u003cspan class=\"cm-spec-label\"\u003eHard Float\u003c\/span\u003e\u003cspan class=\"cm-spec-val\"\u003eTF12 (12 in hard rubber)\u003c\/span\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\n\u003cdiv class=\"cm-fam-card\"\u003e\n\u003cdiv class=\"cm-fam-body\"\u003e\n\u003ch3\u003eSnifter Valves (SV)\u003c\/h3\u003e\n\u003cp class=\"cm-tagline\"\u003eAir Charge · Galvanized Hydropneumatic Tanks\u003c\/p\u003e\n\u003cp class=\"cm-desc\"\u003eSnifter valves admit a small air charge to the suction line on each pump start cycle — replenishes air loss in galvanized hydropneumatic tanks. SV 1LF (1\/8 in) standard installation; SV 1DLF (1\/4 in) domestic version for higher airflow. Required on galvanized tank installs without an AVC, or alongside an AVC for backup air management.\u003c\/p\u003e\n\u003cdiv class=\"cm-spec-row\"\u003e\n\u003cspan class=\"cm-spec-label\"\u003eStandard\u003c\/span\u003e\u003cspan class=\"cm-spec-val\"\u003eSV 1LF (1\/8 in)\u003c\/span\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"cm-spec-row\"\u003e\n\u003cspan class=\"cm-spec-label\"\u003eDomestic Higher Flow\u003c\/span\u003e\u003cspan class=\"cm-spec-val\"\u003eSV 1DLF (1\/4 in)\u003c\/span\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"cm-spec-row\"\u003e\n\u003cspan class=\"cm-spec-label\"\u003eMaterial\u003c\/span\u003e\u003cspan class=\"cm-spec-val\"\u003eLead-free brass\u003c\/span\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"cm-spec-row\"\u003e\n\u003cspan class=\"cm-spec-label\"\u003eBest For\u003c\/span\u003e\u003cspan class=\"cm-spec-val\"\u003eGalvanized tank air recharge\u003c\/span\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\n\u003cdiv class=\"cm-fam-card\"\u003e\n\u003cdiv class=\"cm-fam-body\"\u003e\n\u003ch3\u003eBleeder Orifices (BOB \/ BOR)\u003c\/h3\u003e\n\u003cp class=\"cm-tagline\"\u003eAir Release · AVC Companion\u003c\/p\u003e\n\u003cp class=\"cm-desc\"\u003eBleeder orifices vent excess air from galvanized hydropneumatic tanks — the matched companion to a snifter valve. BOB3LF 3\/4 in lead-free brass for standard install. BOR4 1 in rubber bleeder for larger tanks. Set the orifice diameter to match the tank size — too large vents too much air; too small allows water-logging.\u003c\/p\u003e\n\u003cdiv class=\"cm-spec-row\"\u003e\n\u003cspan class=\"cm-spec-label\"\u003eBrass LF\u003c\/span\u003e\u003cspan class=\"cm-spec-val\"\u003eBOB3LF (3\/4 in)\u003c\/span\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"cm-spec-row\"\u003e\n\u003cspan class=\"cm-spec-label\"\u003eRubber\u003c\/span\u003e\u003cspan class=\"cm-spec-val\"\u003eBOR4 (1 in)\u003c\/span\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"cm-spec-row\"\u003e\n\u003cspan class=\"cm-spec-label\"\u003eFunction\u003c\/span\u003e\u003cspan class=\"cm-spec-val\"\u003eVent excess air from tank\u003c\/span\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"cm-spec-row\"\u003e\n\u003cspan class=\"cm-spec-label\"\u003eBest For\u003c\/span\u003e\u003cspan class=\"cm-spec-val\"\u003eGalvanized tank air balance\u003c\/span\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\n\u003c\/div\u003e\n\u003c\/section\u003e\n\n\u003csection class=\"cm-section alt\"\u003e\n\u003cdiv class=\"cm-inner\"\u003e\n\u003ch2 class=\"cm-h2\"\u003ePressure Relief Valve Sizing\u003c\/h2\u003e\n\u003cp class=\"cm-sub-text\"\u003eMatch relief PSI to system operating pressure — relief should be set \u003cstrong\u003eat least 25 PSI above the pressure switch cut-out\u003c\/strong\u003e to avoid nuisance discharge during normal cycling.\u003c\/p\u003e\n\u003cdiv class=\"table-wrapper\"\u003e\n\u003ctable class=\"cm-tbl\"\u003e\n\u003cthead\u003e\u003ctr\u003e\n\u003cth\u003ePart Number\u003c\/th\u003e\n\u003cth\u003eSize\u003c\/th\u003e\n\u003cth\u003eRelief Pressure\u003c\/th\u003e\n\u003cth\u003eMaterial\u003c\/th\u003e\n\u003cth\u003eApplication\u003c\/th\u003e\n\u003c\/tr\u003e\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd class=\"bld\"\u003eRV2NLF\u003c\/td\u003e\n\u003ctd\u003e1\/2 in\u003c\/td\u003e\n\u003ctd\u003e75 PSI\u003c\/td\u003e\n\u003ctd\u003eBrass LF\u003c\/td\u003e\n\u003ctd\u003eStandard residential 30\/50 system\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd class=\"bld\"\u003eRV3NLF\u003c\/td\u003e\n\u003ctd\u003e3\/4 in\u003c\/td\u003e\n\u003ctd\u003e75 PSI\u003c\/td\u003e\n\u003ctd\u003eBrass LF\u003c\/td\u003e\n\u003ctd\u003eStandard residential larger flow\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd class=\"bld\"\u003eRV2N100-LF\u003c\/td\u003e\n\u003ctd\u003e1\/2 in\u003c\/td\u003e\n\u003ctd\u003e100 PSI\u003c\/td\u003e\n\u003ctd\u003eBrass LF\u003c\/td\u003e\n\u003ctd\u003e40\/60 or 50\/70 system\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd class=\"bld\"\u003eRV3N100-LF\u003c\/td\u003e\n\u003ctd\u003e3\/4 in\u003c\/td\u003e\n\u003ctd\u003e100 PSI\u003c\/td\u003e\n\u003ctd\u003eBrass LF\u003c\/td\u003e\n\u003ctd\u003e40\/60 or 50\/70 larger flow\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd class=\"bld\"\u003eRV2TSS\u003c\/td\u003e\n\u003ctd\u003e1\/2 in\u003c\/td\u003e\n\u003ctd\u003e75 PSI\u003c\/td\u003e\n\u003ctd\u003eStainless\u003c\/td\u003e\n\u003ctd\u003eAggressive water 75 PSI\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd class=\"bld\"\u003eRV3TSS\u003c\/td\u003e\n\u003ctd\u003e3\/4 in\u003c\/td\u003e\n\u003ctd\u003e75 PSI\u003c\/td\u003e\n\u003ctd\u003eStainless\u003c\/td\u003e\n\u003ctd\u003eAggressive water larger flow\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd class=\"bld\"\u003eRV2N100SS\u003c\/td\u003e\n\u003ctd\u003e1\/2 in\u003c\/td\u003e\n\u003ctd\u003e100 PSI\u003c\/td\u003e\n\u003ctd\u003eStainless\u003c\/td\u003e\n\u003ctd\u003eAggressive water 100 PSI\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd class=\"bld\"\u003eRV3N100SS\u003c\/td\u003e\n\u003ctd\u003e3\/4 in\u003c\/td\u003e\n\u003ctd\u003e100 PSI\u003c\/td\u003e\n\u003ctd\u003eStainless\u003c\/td\u003e\n\u003ctd\u003eAggressive water 100 PSI larger\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd class=\"bld\"\u003eRV 2LF\u003c\/td\u003e\n\u003ctd\u003e1\/2 in\u003c\/td\u003e\n\u003ctd\u003e75 PSI\u003c\/td\u003e\n\u003ctd\u003ePremium LF\u003c\/td\u003e\n\u003ctd\u003ePremium domestic relief valve\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/div\u003e\n\u003cp class=\"cm-sub-text\" style=\"margin-top:14px;font-size:13px\"\u003e\u003cstrong\u003eSizing rule:\u003c\/strong\u003e Relief PSI = pressure switch cut-out + 25 PSI minimum. 30\/50 system = 75 PSI relief. 40\/60 or 50\/70 system = 100 PSI relief. Mount the relief valve on the tank tee or as close to the pressure tank as practical.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/section\u003e\n\n\u003csection class=\"cm-section\"\u003e\n\u003ch2 class=\"cm-h2\"\u003eTank Float Valve Reference\u003c\/h2\u003e\n\u003cp class=\"cm-sub-text\"\u003eFloat valves cut off the supply line when the tank reaches a set level — the simplest possible storage-tank fill control. No electricity, no switches, no failure modes that strand the install.\u003c\/p\u003e\n\u003cdiv class=\"table-wrapper\"\u003e\n\u003ctable class=\"cm-tbl\"\u003e\n\u003cthead\u003e\u003ctr\u003e\n\u003cth\u003ePart Number\u003c\/th\u003e\n\u003cth\u003eConfiguration\u003c\/th\u003e\n\u003cth\u003eApplication\u003c\/th\u003e\n\u003c\/tr\u003e\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd class=\"bld\"\u003eTFV-1LF\u003c\/td\u003e\n\u003ctd\u003eComplete assembly — valve, rod, float\u003c\/td\u003e\n\u003ctd\u003eStandard cistern \/ storage tank fill — ready to install\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd class=\"bld\"\u003eTFV-KLF\u003c\/td\u003e\n\u003ctd\u003eUnassembled kit — all components\u003c\/td\u003e\n\u003ctd\u003eCustom installs · non-standard rod length\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd class=\"bld\"\u003eTFVLF\u003c\/td\u003e\n\u003ctd\u003eFloat valve only (no rod, no float)\u003c\/td\u003e\n\u003ctd\u003eReplacement when rod \/ float still serviceable\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd class=\"bld\"\u003eTF12\u003c\/td\u003e\n\u003ctd\u003e12 in hard-rubber float only\u003c\/td\u003e\n\u003ctd\u003eLarger storage tanks · replacement on TFV-1 series\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/div\u003e\n\u003c\/section\u003e\n\n\u003csection class=\"cm-section alt\"\u003e\n\u003cdiv class=\"cm-inner\"\u003e\n\u003ch2 class=\"cm-h2\"\u003eSnifter \u0026amp; Bleeder Reference\u003c\/h2\u003e\n\u003cp class=\"cm-sub-text\"\u003eSnifter and bleeder pairs maintain air cushion in galvanized hydropneumatic tanks. The snifter admits air on each pump start; the bleeder vents excess air to maintain balance.\u003c\/p\u003e\n\u003cdiv class=\"table-wrapper\"\u003e\n\u003ctable class=\"cm-tbl\"\u003e\n\u003cthead\u003e\u003ctr\u003e\n\u003cth\u003eType\u003c\/th\u003e\n\u003cth\u003ePart Number\u003c\/th\u003e\n\u003cth\u003eSize\u003c\/th\u003e\n\u003cth\u003eApplication\u003c\/th\u003e\n\u003c\/tr\u003e\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd class=\"bld\"\u003eSnifter\u003c\/td\u003e\n\u003ctd\u003eSV 1LF\u003c\/td\u003e\n\u003ctd\u003e1\/8 in\u003c\/td\u003e\n\u003ctd\u003eStandard snifter for galvanized tank\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd class=\"bld\"\u003eSnifter\u003c\/td\u003e\n\u003ctd\u003eSV 1DLF\u003c\/td\u003e\n\u003ctd\u003e1\/4 in\u003c\/td\u003e\n\u003ctd\u003eHigher airflow domestic version\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd class=\"bld\"\u003eBleeder\u003c\/td\u003e\n\u003ctd\u003eBOB3LF\u003c\/td\u003e\n\u003ctd\u003e3\/4 in brass\u003c\/td\u003e\n\u003ctd\u003eStandard bleeder orifice for residential galvanized tank\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd class=\"bld\"\u003eBleeder\u003c\/td\u003e\n\u003ctd\u003eBOR4\u003c\/td\u003e\n\u003ctd\u003e1 in rubber\u003c\/td\u003e\n\u003ctd\u003eLarger tank or higher air-release demand\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/div\u003e\n\u003cp class=\"cm-sub-text\" style=\"margin-top:14px;font-size:13px\"\u003e\u003cstrong\u003eBladder tanks do NOT need snifter or bleeder valves.\u003c\/strong\u003e The bladder maintains air-water separation internally — no atmospheric exchange required. Snifter\/bleeder are exclusively for galvanized hydropneumatic (air-over-water) tanks.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/section\u003e\n\n\u003csection class=\"cm-pe-block\"\u003e\n\u003cdiv class=\"cm-pe-inner\"\u003e\n\u003ch2\u003eSpecialty Valve Best Practices\u003c\/h2\u003e\n\u003cp class=\"cm-sub-light\"\u003eThese are the valves that quietly do their job for 15–25 years until the day they're missing — and you find out by way of a flooded mechanical room or a water-logged tank.\u003c\/p\u003e\n\u003cdiv class=\"cm-pe-grid\"\u003e\n\u003cdiv class=\"cm-pe-item\"\u003e\n\u003ch4\u003eAlways Install a Relief Valve\u003c\/h4\u003e\n\u003cp\u003eEvery pressure tank install should have a relief valve. Pump switches fail. Pressure switches stick. Thermal expansion in closed systems creates surprising pressure spikes. \u003cstrong\u003eThe $20 relief valve prevents the $2,000 burst tank.\u003c\/strong\u003e\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"cm-pe-item\"\u003e\n\u003ch4\u003eRelief Sizing Rule\u003c\/h4\u003e\n\u003cp\u003eSet relief PSI \u003cstrong\u003e25 PSI above pressure switch cut-out\u003c\/strong\u003e. 30\/50 switch = 75 PSI relief (RV-NLF). 40\/60 or 50\/70 switch = 100 PSI relief (RV-N100-LF). Too low = nuisance discharge during normal cycles. Too high = no protection.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"cm-pe-item\"\u003e\n\u003ch4\u003eMount Relief on the Tank Tee\u003c\/h4\u003e\n\u003cp\u003eThe relief valve port should be on the \u003cstrong\u003epressure tank manifold or tank tee\u003c\/strong\u003e. Discharge should pipe to a safe location — floor drain, exterior, or sump. Don't cap the discharge — that defeats the entire valve.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"cm-pe-item\"\u003e\n\u003ch4\u003eFloat Valve Set Point\u003c\/h4\u003e\n\u003cp\u003eAdjust the float arm to \u003cstrong\u003ecut off supply approximately 2–4 in below the tank's overflow port\u003c\/strong\u003e. Too high and overflow may occur during inlet pressure surges; too low and tank capacity is wasted.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"cm-pe-item\"\u003e\n\u003ch4\u003eSnifter + Bleeder = Pair\u003c\/h4\u003e\n\u003cp\u003eOn galvanized hydropneumatic tanks, the snifter and bleeder must be \u003cstrong\u003ematched as a pair\u003c\/strong\u003e. Snifter alone over-pressurizes the tank with air. Bleeder alone never replenishes lost air. Always specify both unless the tank already has an AVC.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"cm-pe-item\"\u003e\n\u003ch4\u003eStainless for Hot Water or Salt\u003c\/h4\u003e\n\u003cp\u003eHot water service, salt-influenced groundwater, and high-chloride wells corrode brass relief valves within 5–8 years — and the corroded valve doesn't relieve at the rated pressure. \u003cstrong\u003eSpecify stainless (TSS suffix)\u003c\/strong\u003e for these conditions.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/section\u003e\n\n\u003csection class=\"cm-section\"\u003e\n\u003ch2 class=\"cm-h2\"\u003eApplication Selection\u003c\/h2\u003e\n\u003cdiv class=\"cm-app-grid\"\u003e\n\u003cdiv class=\"cm-app-card\"\u003e\n\u003ch4\u003eStandard Residential 30\/50 System\u003c\/h4\u003e\n\u003cp\u003eUse \u003cstrong\u003eRV3NLF (3\/4 in, 75 PSI)\u003c\/strong\u003e mounted on the tank tee. Matches 30\/50 switch with 25 PSI safety margin.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"cm-app-card\"\u003e\n\u003ch4\u003eModern Residential 40\/60 System\u003c\/h4\u003e\n\u003cp\u003eUse \u003cstrong\u003eRV3N100-LF (3\/4 in, 100 PSI)\u003c\/strong\u003e. Matches 40\/60 or 50\/70 switch with 30–40 PSI safety margin. Standard for new bladder tank installs.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"cm-app-card\"\u003e\n\u003ch4\u003eCistern Fill from Well\u003c\/h4\u003e\n\u003cp\u003eUse \u003cstrong\u003eTFV-1LF complete tank float valve\u003c\/strong\u003e. Drop the float in the cistern; well pump fills until float closes the valve. No electrical control needed.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"cm-app-card\"\u003e\n\u003ch4\u003eLivestock Trough Fill\u003c\/h4\u003e\n\u003cp\u003eUse \u003cstrong\u003eTFV-1LF or TFV-KLF\u003c\/strong\u003e with TF12 hard-rubber float. The hard-rubber float resists damage from livestock and chemical attack from manure-saturated water.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"cm-app-card\"\u003e\n\u003ch4\u003eGalvanized Hydropneumatic Tank — New Install\u003c\/h4\u003e\n\u003cp\u003eUse \u003cstrong\u003eSV 1LF snifter + BOB3LF bleeder pair\u003c\/strong\u003e. Standard combination for residential galvanized tank without an AVC.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"cm-app-card\"\u003e\n\u003ch4\u003eAggressive Water \/ Hot Water\u003c\/h4\u003e\n\u003cp\u003eUse \u003cstrong\u003eRV3TSS (75 PSI) or RV3N100SS (100 PSI) stainless\u003c\/strong\u003e. Required for high-iron, high-chloride, salt-influenced water and any hot-water service.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"cm-app-card\"\u003e\n\u003ch4\u003eCustom Float Install\u003c\/h4\u003e\n\u003cp\u003eUse \u003cstrong\u003eTFV-KLF unassembled kit + custom rod length + standard or hard-rubber float\u003c\/strong\u003e. For non-standard tank depths or unique float positioning requirements.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"cm-app-card\"\u003e\n\u003ch4\u003eTank Float Replacement Only\u003c\/h4\u003e\n\u003cp\u003eUse \u003cstrong\u003eTF12 12 in hard-rubber float\u003c\/strong\u003e. Replacement when the original float is damaged or punctured but the rod and valve are still serviceable.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/section\u003e\n\n\u003csection class=\"cm-section\"\u003e\n\u003ch2 class=\"cm-h2\"\u003eFrequently Asked Questions\u003c\/h2\u003e\n\u003cdiv class=\"cm-faq\"\u003e\n\n\u003cdetails class=\"cm-faq-item\"\u003e\n\u003csummary\u003eDo I really need a relief valve on a residential well system?\u003c\/summary\u003e\n\u003cdiv class=\"cm-faq-body\"\u003e\n\u003cstrong\u003eYes.\u003c\/strong\u003e Pressure switches fail closed, pump motors run away on bad capacitors, and thermal expansion in a closed system creates surprising pressure spikes when the pump cycles into a hot mechanical room. The $20 relief valve discharges harmlessly when any of these happens. Without it, the bladder tank ruptures, the pressure switch blows apart, or worst case the galvanized tank tears at the seam — \u003cstrong\u003eseveral thousand dollars of damage prevented by the cheapest valve in the system\u003c\/strong\u003e.\u003c\/div\u003e\n\u003c\/details\u003e\n\n\u003cdetails class=\"cm-faq-item\"\u003e\n\u003csummary\u003eWhat pressure relief setting should I use?\u003c\/summary\u003e\n\u003cdiv class=\"cm-faq-body\"\u003e\n\u003cstrong\u003e25 PSI above your pressure switch cut-out.\u003c\/strong\u003e 30\/50 switch = 75 PSI relief (RV3NLF). 40\/60 switch = 100 PSI relief (RV3N100-LF). 50\/70 switch = 100 PSI relief (the next standard rating up). Don't go lower — you'll get nuisance discharge every cycle. Don't go higher — the relief won't trip before the tank fails.\u003c\/div\u003e\n\u003c\/details\u003e\n\n\u003cdetails class=\"cm-faq-item\"\u003e\n\u003csummary\u003eWhere should the relief valve discharge?\u003c\/summary\u003e\n\u003cdiv class=\"cm-faq-body\"\u003ePipe the discharge to a \u003cstrong\u003esafe location\u003c\/strong\u003e — floor drain, sump, exterior, or visible drip pan. Never cap the discharge or pipe it to a closed reservoir — that completely defeats the valve. Local code may require an air gap on the discharge to prevent backflow contamination.\u003c\/div\u003e\n\u003c\/details\u003e\n\n\u003cdetails class=\"cm-faq-item\"\u003e\n\u003csummary\u003eWhat's the difference between TFV-1LF and TFV-KLF?\u003c\/summary\u003e\n\u003cdiv class=\"cm-faq-body\"\u003e\n\u003cstrong\u003eTFV-1LF\u003c\/strong\u003e is the complete assembled tank float valve — valve, rod, float, ready to install. Use this for standard cistern and storage tank applications. \u003cstrong\u003eTFV-KLF\u003c\/strong\u003e is the unassembled kit — all components but you build it on site. Use this when you need a custom rod length or non-standard float positioning.\u003c\/div\u003e\n\u003c\/details\u003e\n\n\u003cdetails class=\"cm-faq-item\"\u003e\n\u003csummary\u003eDo I need a snifter valve on a bladder tank?\u003c\/summary\u003e\n\u003cdiv class=\"cm-faq-body\"\u003e\n\u003cstrong\u003eNo.\u003c\/strong\u003e Bladder tanks have a sealed butyl bladder that maintains air-water separation internally — no atmospheric air exchange required. Snifter and bleeder valves are exclusively for \u003cstrong\u003egalvanized hydropneumatic (air-over-water) tanks\u003c\/strong\u003e where atmospheric air absorbs into the water over time and must be replenished.\u003c\/div\u003e\n\u003c\/details\u003e\n\n\u003cdetails class=\"cm-faq-item\"\u003e\n\u003csummary\u003eSnifter alone or snifter + bleeder?\u003c\/summary\u003e\n\u003cdiv class=\"cm-faq-body\"\u003eOn galvanized tanks, install \u003cstrong\u003eboth as a matched pair\u003c\/strong\u003e. The snifter admits a small air charge on each pump start; the bleeder vents excess air to maintain balance. Snifter alone over-pressurizes the tank with air. Bleeder alone never replenishes lost air. The pair self-regulates to maintain the proper air cushion.\u003c\/div\u003e\n\u003c\/details\u003e\n\n\u003cdetails class=\"cm-faq-item\"\u003e\n\u003csummary\u003eStainless or brass relief valve?\u003c\/summary\u003e\n\u003cdiv class=\"cm-faq-body\"\u003eBrass is fine for clean residential drinking water. \u003cstrong\u003eSpecify stainless (RV2TSS, RV3TSS, RV2N100SS, RV3N100SS)\u003c\/strong\u003e for: high-iron groundwater (East Texas), high-chloride \/ salt-influenced (coastal Gulf Coast), sulfide-bearing (rotten-egg smell), and any hot-water service. The corroded brass valve doesn't relieve at rated pressure when it's the only thing protecting your tank from rupture.\u003c\/div\u003e\n\u003c\/details\u003e\n\n\u003cdetails class=\"cm-faq-item\"\u003e\n\u003csummary\u003eHow do I know my relief valve is working?\u003c\/summary\u003e\n\u003cdiv class=\"cm-faq-body\"\u003eTest annually. Lift the test lever briefly — the valve should discharge water and reseat cleanly when released. \u003cstrong\u003eIf the valve drips after testing, replace it\u003c\/strong\u003e — the seat is worn and won't seal. If the valve doesn't discharge when you lift the lever, replace it — the seat is stuck. Either way, $20 of insurance.\u003c\/div\u003e\n\u003c\/details\u003e\n\n\u003cdetails class=\"cm-faq-item\"\u003e\n\u003csummary\u003eCan I use a snifter valve on a city water system?\u003c\/summary\u003e\n\u003cdiv class=\"cm-faq-body\"\u003eNo — snifter valves admit air to the suction line. \u003cstrong\u003eCity water systems are pressurized from the utility side\u003c\/strong\u003e, not by a well pump drawing through suction. The snifter would either fail to open (no suction to draw air) or contaminate the water with airborne pollutants. Snifter valves are exclusively for well systems with galvanized hydropneumatic tanks.\u003c\/div\u003e\n\u003c\/details\u003e\n\n\u003c\/div\u003e\n\u003c\/section\u003e\n\n\u003csection class=\"cm-final\"\u003e\n\u003ch2\u003eNeed Help Specifying System-Protection Valves?\u003c\/h2\u003e\n\u003cp\u003eTell us your pressure switch range, tank type (bladder or galvanized), water chemistry, and what you're protecting (residential tank, cistern, livestock trough). We'll spec the right relief, float, snifter, and bleeder combination and ship from Houston same day.\u003c\/p\u003e\n\u003ca href=\"tel:2816648000\" class=\"cm-phone\"\u003e281.664.8000\u003c\/a\u003e\n\u003cdiv class=\"cm-cta-row\"\u003e\n\u003ca href=\"mailto:sales@watermainsupply.com\" class=\"cm-btn\"\u003eEmail sales@watermainsupply.com\u003c\/a\u003e\n\u003ca href=\"tel:2816648000\" class=\"cm-btn-out\"\u003eCall Now\u003c\/a\u003e\n\u003c\/div\u003e\n\u003c\/section\u003e\n\n\u003cdiv class=\"cm-foot\"\u003e\nWatermain Supply · Authorized Campbell Manufacturing Distributor · Houston, TX\u003cbr\u003e\n281.664.8000 · sales@watermainsupply.com · www.watermainsupply.com\n\u003c\/div\u003e\n\n\u003c\/div\u003e","products":[{"product_id":"campbell-tank-float-air-valve-accessories","title":"Campbell Tank Float \u0026 Air Valve Accessories","description":"\u003c!-- TABS --\u003e\n\u003ch5\u003eDescription\u003c\/h5\u003e\n\u003cp\u003e\u003cstrong\u003eCampbell Tank Float \u0026amp; Air Valve Accessories\u003c\/strong\u003e by Campbell Manufacturing.\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eTank Float Valve (TFV): red brass — controls water level and acts as check valve against back flow\u003c\/li\u003e\n\u003cli\u003eTank Float (TF12): 12\" diameter with UV\/corrosion-resistant polyethylene and styrofoam core\u003c\/li\u003e\n\u003cli\u003eBleeder Orifice (BOB\/BOR): imported, 3\/4\" brass or 1\" rubber — used with air volume controls\u003c\/li\u003e\n\u003cli\u003eSnifter Valve (SV): imported unplated brass, 1\/4\" — with rubber gasket for air admission\u003c\/li\u003e\n\u003cli\u003eSelect Category and Description from the dropdowns\u003c\/li\u003e\n\u003c\/ul\u003e\n","brand":"Campbell","offers":[{"title":"Tank Float Valve \/ 1\" FPT Assembled","offer_id":46789432836271,"sku":"TFV-1LF","price":134.33,"currency_code":"USD","in_stock":true},{"title":"Tank Float Valve \/ 1\" FPT Unassembled 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Valve \/ 1\/8\" Nickel-Plated Brass Imported","offer_id":46789433098415,"sku":"SV 0LF","price":0.0,"currency_code":"USD","in_stock":true},{"title":"Snifter Valve \/ 1\/8\" Nickel-Plated Brass Domestic","offer_id":46789433131183,"sku":"SV 0DLF","price":0.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0264\/1913\/4527\/files\/Miscellaneous_Valves_I1.png?v=1776785558"},{"product_id":"campbell-relief-flow-regulator-valve","title":"Campbell Relief Valve \u0026 Flow Regulator","description":"\u003c!-- TABS --\u003e\n\u003ch5\u003eDescription\u003c\/h5\u003e\n\u003cp\u003e\u003cstrong\u003eCampbell Relief Valve \u0026amp; Flow Regulator\u003c\/strong\u003e by Campbell Manufacturing.\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eRelief Valve Imported Brass (RV-NLF): non-adjustable, 75 or 100 PSI — 1\/2\" and 3\/4\"\u003c\/li\u003e\n\u003cli\u003eRelief Valve Imported Stainless (RV-TSS \/ RV-N100SS): non-adjustable 75 or 100 PSI\u003c\/li\u003e\n\u003cli\u003eRelief Valve Heavy Duty (RV-LF): 10-200 PSI adjustable, 1\/2\" to 2\" — sold preset only\u003c\/li\u003e\n\u003cli\u003eDOLE Flow Regulators: self-cleaning, flexible orifice, responds to pressure surges up to 125 PSI\u003c\/li\u003e\n\u003cli\u003eY-Series (3\/4\" MIP x 3\/4\" FIP brass), B-Series (1\/2\" FIP), C-Series (3\/4\" FIP), X-Series (1\" FIP)\u003c\/li\u003e\n\u003cli\u003eDelivers constant flow within ±15% — installs between check valve and pressure tank\u003c\/li\u003e\n\u003cli\u003eSelect Type, Size, and Pressure \/ Flow Rate from the dropdowns\u003c\/li\u003e\n\u003c\/ul\u003e\n","brand":"Campbell","offers":[{"title":"Relief Valve Imported Brass \/ 1\/2\" \/ 75 PSI","offer_id":46789437849775,"sku":"RV2NLF","price":28.74,"currency_code":"USD","in_stock":true},{"title":"Relief Valve Imported Brass \/ 3\/4\" \/ 75 PSI","offer_id":46789437882543,"sku":"RV3NLF","price":22.5,"currency_code":"USD","in_stock":true},{"title":"Relief Valve 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