Campbell Miscellaneous Valves

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Campbell Relief Valve & Flow Regulator
Campbell Relief Valves I1

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Campbell Relief Valve & Flow Regulator

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Campbell Tank Float & Air Valve Accessories
Campbell Relief Valves I1

Campbell

Campbell Tank Float & Air Valve Accessories

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Campbell Miscellaneous Valves
Catalog › Campbell › Miscellaneous Valves
Relief · Float · Snifter · Bleeder Orifice

Miscellaneous ValvesPressure Relief · Tank Float · Snifter · Bleeder · Specialty

Pressure 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.

Request a Quote Call 281.664.8000
2
Relief Pressures
LF + SS
Material Options
12"
Tank Float Diameter
60+
Catalog SKUs

Specialty Valve Categories

Four 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.

Pressure Relief Valves (RV)

75 PSI & 100 PSI · LF and Stainless

Pressure 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.

75 PSI Brass LFRV2NLF, RV3NLF
100 PSI Brass LFRV2N100-LF, RV3N100-LF
75 PSI StainlessRV2TSS, RV3TSS
100 PSI StainlessRV2N100SS, RV3N100SS

Tank Float Valves (TFV)

Storage Tanks · Cisterns · Float-Actuated Fill

Mechanical 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.

AssembledTFV-1LF
Unassembled KitTFV-KLF
Valve OnlyTFVLF
Hard FloatTF12 (12 in hard rubber)

Snifter Valves (SV)

Air Charge · Galvanized Hydropneumatic Tanks

Snifter 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.

StandardSV 1LF (1/8 in)
Domestic Higher FlowSV 1DLF (1/4 in)
MaterialLead-free brass
Best ForGalvanized tank air recharge

Bleeder Orifices (BOB / BOR)

Air Release · AVC Companion

Bleeder 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.

Brass LFBOB3LF (3/4 in)
RubberBOR4 (1 in)
FunctionVent excess air from tank
Best ForGalvanized tank air balance

Pressure Relief Valve Sizing

Match relief PSI to system operating pressure — relief should be set at least 25 PSI above the pressure switch cut-out to avoid nuisance discharge during normal cycling.

Part Number Size Relief Pressure Material Application
RV2NLF 1/2 in 75 PSI Brass LF Standard residential 30/50 system
RV3NLF 3/4 in 75 PSI Brass LF Standard residential larger flow
RV2N100-LF 1/2 in 100 PSI Brass LF 40/60 or 50/70 system
RV3N100-LF 3/4 in 100 PSI Brass LF 40/60 or 50/70 larger flow
RV2TSS 1/2 in 75 PSI Stainless Aggressive water 75 PSI
RV3TSS 3/4 in 75 PSI Stainless Aggressive water larger flow
RV2N100SS 1/2 in 100 PSI Stainless Aggressive water 100 PSI
RV3N100SS 3/4 in 100 PSI Stainless Aggressive water 100 PSI larger
RV 2LF 1/2 in 75 PSI Premium LF Premium domestic relief valve

Sizing rule: 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.

Tank Float Valve Reference

Float 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.

Part Number Configuration Application
TFV-1LF Complete assembly — valve, rod, float Standard cistern / storage tank fill — ready to install
TFV-KLF Unassembled kit — all components Custom installs · non-standard rod length
TFVLF Float valve only (no rod, no float) Replacement when rod / float still serviceable
TF12 12 in hard-rubber float only Larger storage tanks · replacement on TFV-1 series

Snifter & Bleeder Reference

Snifter 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.

Type Part Number Size Application
Snifter SV 1LF 1/8 in Standard snifter for galvanized tank
Snifter SV 1DLF 1/4 in Higher airflow domestic version
Bleeder BOB3LF 3/4 in brass Standard bleeder orifice for residential galvanized tank
Bleeder BOR4 1 in rubber Larger tank or higher air-release demand

Bladder tanks do NOT need snifter or bleeder valves. The bladder maintains air-water separation internally — no atmospheric exchange required. Snifter/bleeder are exclusively for galvanized hydropneumatic (air-over-water) tanks.

Specialty Valve Best Practices

These 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.

Always Install a Relief Valve

Every pressure tank install should have a relief valve. Pump switches fail. Pressure switches stick. Thermal expansion in closed systems creates surprising pressure spikes. The $20 relief valve prevents the $2,000 burst tank.

Relief Sizing Rule

Set relief PSI 25 PSI above pressure switch cut-out. 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.

Mount Relief on the Tank Tee

The relief valve port should be on the pressure tank manifold or tank tee. Discharge should pipe to a safe location — floor drain, exterior, or sump. Don't cap the discharge — that defeats the entire valve.

Float Valve Set Point

Adjust the float arm to cut off supply approximately 2–4 in below the tank's overflow port. Too high and overflow may occur during inlet pressure surges; too low and tank capacity is wasted.

Snifter + Bleeder = Pair

On galvanized hydropneumatic tanks, the snifter and bleeder must be matched as a pair. Snifter alone over-pressurizes the tank with air. Bleeder alone never replenishes lost air. Always specify both unless the tank already has an AVC.

Stainless for Hot Water or Salt

Hot 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. Specify stainless (TSS suffix) for these conditions.

Application Selection

Standard Residential 30/50 System

Use RV3NLF (3/4 in, 75 PSI) mounted on the tank tee. Matches 30/50 switch with 25 PSI safety margin.

Modern Residential 40/60 System

Use RV3N100-LF (3/4 in, 100 PSI). Matches 40/60 or 50/70 switch with 30–40 PSI safety margin. Standard for new bladder tank installs.

Cistern Fill from Well

Use TFV-1LF complete tank float valve. Drop the float in the cistern; well pump fills until float closes the valve. No electrical control needed.

Livestock Trough Fill

Use TFV-1LF or TFV-KLF with TF12 hard-rubber float. The hard-rubber float resists damage from livestock and chemical attack from manure-saturated water.

Galvanized Hydropneumatic Tank — New Install

Use SV 1LF snifter + BOB3LF bleeder pair. Standard combination for residential galvanized tank without an AVC.

Aggressive Water / Hot Water

Use RV3TSS (75 PSI) or RV3N100SS (100 PSI) stainless. Required for high-iron, high-chloride, salt-influenced water and any hot-water service.

Custom Float Install

Use TFV-KLF unassembled kit + custom rod length + standard or hard-rubber float. For non-standard tank depths or unique float positioning requirements.

Tank Float Replacement Only

Use TF12 12 in hard-rubber float. Replacement when the original float is damaged or punctured but the rod and valve are still serviceable.

Frequently Asked Questions

Do I really need a relief valve on a residential well system?
Yes. 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 — several thousand dollars of damage prevented by the cheapest valve in the system.
What pressure relief setting should I use?
25 PSI above your pressure switch cut-out. 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.
Where should the relief valve discharge?
Pipe the discharge to a safe location — 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.
What's the difference between TFV-1LF and TFV-KLF?
TFV-1LF is the complete assembled tank float valve — valve, rod, float, ready to install. Use this for standard cistern and storage tank applications. TFV-KLF 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.
Do I need a snifter valve on a bladder tank?
No. 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 galvanized hydropneumatic (air-over-water) tanks where atmospheric air absorbs into the water over time and must be replenished.
Snifter alone or snifter + bleeder?
On galvanized tanks, install both as a matched pair. 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.
Stainless or brass relief valve?
Brass is fine for clean residential drinking water. Specify stainless (RV2TSS, RV3TSS, RV2N100SS, RV3N100SS) 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.
How do I know my relief valve is working?
Test annually. Lift the test lever briefly — the valve should discharge water and reseat cleanly when released. If the valve drips after testing, replace it — 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.
Can I use a snifter valve on a city water system?
No — snifter valves admit air to the suction line. City water systems are pressurized from the utility side, 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.

Need Help Specifying System-Protection Valves?

Tell 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.

281.664.8000
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Watermain Supply · Authorized Campbell Manufacturing Distributor · Houston, TX
281.664.8000 · sales@watermainsupply.com · www.watermainsupply.com