Plumbing Valve Products
Shutoff and Isolation Valves
Ball valves open and close with a quarter turn of a ported ball, in full-port or standard-port designs. Gate valves lift a wedge with a multi-turn stem for unrestricted flow. Shutoff and stop valves isolate a branch or appliance, and supply stop valves connect fixture supply lines at sinks and toilets.
Flow Regulation and Diverting Valves
Globe valves throttle flow with an adjustable disc and seat for balancing and bypass lines. Butterfly valves rotate a disc a quarter turn on larger commercial lines. Plug valves seal with a tapered or cylindrical plug. Three-way valves divert flow from one inlet to either of two outlets.
Backflow and Reverse-Flow Protection
Check valves allow flow in one direction and close when flow reverses, protecting pumps and equipment. Backflow preventers, including double check and reduced pressure zone assemblies, protect potable water from contamination and are required by code at specified cross-connections.
Pressure and Temperature Control
Pressure reducing valves lower incoming street pressure to a set outlet pressure, providing water pressure control that protects fixtures and appliances. Pressure balance valves hold shower temperature steady when hot or cold supply pressure drops. Rough-in valves are the in-wall valve bodies that shower and tub trim mounts to.
Outdoor Water and Drain Valves
Hose bibbs and sillcocks supply exterior hose connections, and frost-free sillcocks place the valve seat inside the heated wall. Wall hydrants mount through the building wall for residential and commercial washdown. Yard hydrants install below the frost line for freestanding water service. Boiler drain valves empty boilers, tanks, and low points.
Gas, Venting, and Specialty Valves
Gas valves are listed for natural gas or propane service at appliances and meters. Air admittance valves admit air to drain lines where a conventional vent is impractical and local code permits them. Specialty valves and valve kits, parts, and accessories support repairs.
How Plumbing Valves Work and Where to Use Them
Valves provide plumbing flow control in one of three ways. Quarter-turn water control valves, such as ball, butterfly, and plug valves, open or close with a 90-degree handle rotation. Multi-turn valves, such as gate, globe, and stop valves, move a stem through several turns for gradual opening and throttling. Automatic valves, such as check, pressure reducing, and air admittance valves, respond to pressure or flow without a handle.
Common plumbing valve applications include:
Water service: main shutoffs, pressure reducing valves, and backflow assemblies near the meter
Fixtures: supply stops, rough-in valves, and pressure balance valves
Heating: boiler drains and isolation valves for maintenance
Exterior: sillcocks and wall hydrants for hose connections
Fuel gas: listed gas valves at each appliance
Key Specifications and Planning Steps
Specifications to Confirm
Pipe size: match nominal pipe size and confirm full-port or standard-port flow.
Connection type: threaded (FIP or MIP), sweat, press, PEX (F1807 or F1960), compression, push-fit, or solvent weld.
Pressure and temperature: rated cold working pressure (CWP or WOG) and maximum temperature must exceed system conditions.
Material: brass or bronze for potable water, stainless steel for corrosive service, PVC or CPVC for plastic piping.
Lead-free marking: potable-water valves must meet the federal 0.25% weighted average lead limit, typically shown as NSF/ANSI/CAN 372 certification.
Planning Steps
1. Identify the valve function and medium.
2. Verify local code for backflow, pressure reducing, and air admittance valves.
3. Order plumbing valve supplies and repair kits together.
Choosing the Right Plumbing Valve
When comparing plumbing valves for sale, start with the function the line needs: isolation, throttling, reverse-flow protection, or pressure control. Residential work usually calls for compact quarter-turn valves, supply stops, and frost-free sillcocks. Commercial systems add larger butterfly and gate valves, testable backflow assemblies, and valves rated for higher flow and pressure. Confirm the valve connects to existing pipe fittings and supply lines without extra adapters, and choose plumbing valves with service access for future repair. For service work, keep repair kits, stems, and cartridges on hand for the plumbing valve products already installed, so worn parts can be replaced without cutting out the valve body. On potable lines, verify lead-free certification before installation.
Frequently Asked Questions
Where can I buy plumbing valves for both residential and commercial jobs from one supplier?
A category that groups both job types lets you source plumbing valves from one supplier. This category includes ball, gate, check, and backflow valves alongside supply stops, sillcocks, butterfly valves, and pressure reducing valves, covering fixture-level and building-level work.
Which plumbing valves should I stock on a service truck?
Common truck stock includes 1/2 in. and 3/4 in. ball valves, angle and straight supply stops, shutoff valves, frost-free sillcocks, hose bibbs, and valve repair kits. Carry the connection types used in your area, such as sweat, PEX, and compression.
What differences matter when choosing a ball valve or a gate valve for main-line isolation?
Ball valves close with a quarter turn and seal tightly, which helps in emergency shutoff. Gate valves open with several turns and give unrestricted flow when fully open. Pipe size, system pressure, flow needs, and local code determine which suits a main shutoff.
What is the difference between a sillcock, a hose bibb, a wall hydrant, and a yard hydrant?
A hose bibb is a basic faucet with a hose-thread outlet. A sillcock mounts through the sill or exterior wall, often in a frost-free design. A wall hydrant is a heavier wall-mounted unit for washdown. A yard hydrant is a freestanding post with its valve buried below the frost line, away from the building.
How does a check valve differ from a backflow preventer, and when is a code-approved assembly required?
A check valve stops reverse flow to protect equipment, but it is not a code-approved cross-connection control device. Backflow preventers, such as double check and reduced pressure zone assemblies, are certified to protect potable water. Local code and the water purveyor set where a testable assembly is required, such as irrigation, fire, and boiler connections.
What valve controls water pressure that is too high and damaging fixtures?
A pressure reducing valve, installed after the main shutoff, lowers street pressure to an adjustable outlet setting for water pressure control. The model plumbing codes call for one where static pressure exceeds 80 psi. Check pressure with a gauge at a hose connection before and after installation.
My shower temperature swings when a toilet flushes. Could a pressure-balance or thermostatic valve fix it, and how do I tell which type is installed?
A pressure balance valve compensates for pressure drops in the hot or cold supply, which is the usual cause of this problem. A thermostatic valve responds to water temperature directly. The manufacturer and model on the trim or valve body identify the type, and a worn cartridge can also cause temperature swings.
How do I vent a sink drain without a vent through the roof, and where are air admittance valves allowed?
An air admittance valve opens under negative drain pressure to admit air and closes to block sewer gas. It must stay accessible and be installed at the height the manufacturer and code specify. Some jurisdictions limit or prohibit air admittance valves, so confirm local code before installing one.
FAQ 9: What valve should I use to drain a boiler or water heater for maintenance?
A boiler drain valve provides a hose-thread outlet for draining boilers, water heaters, and system low points. Match the inlet connection, such as threaded or sweat, to the tapping, and confirm the temperature rating suits hot water service.
FAQ 10: What frost-protection features should I look for when replacing an outdoor faucet that keeps freezing?
Look for a frost-free sillcock or wall hydrant with a stem long enough to place the valve seat inside the heated space. Install it with a slight downward pitch so it drains, choose a model with an integral vacuum breaker, and disconnect hoses before freezing weather.
What are the main types of plumbing valves and what does each one do?
The main plumbing valve products include ball and gate valves for shutoff, globe and butterfly valves for flow regulation, check valves and backflow preventers for reverse-flow protection, pressure reducing and pressure balance valves for pressure control, sillcocks and hydrants for outdoor water, and gas and air admittance valves for specialty service.
What should I check before choosing a plumbing valve: pipe size, connection type, pressure rating, or material?
Check all four. Match nominal pipe size, choose a connection that fits the pipe material, confirm the pressure and temperature rating exceed system conditions, and select a body material suited to the medium, such as brass for potable water or stainless steel for corrosive service.
How do I verify that a brass plumbing valve is certified lead-free for drinking water lines?
Brass is not automatically lead-free. Valves for drinking water must meet the federal 0.25% weighted average lead limit on wetted surfaces. Look for NSF/ANSI/CAN 372 or NSF/ANSI/CAN 61 marks, "LF" in the model number, or lead-free labeling on the valve or packaging.
How do water control valves for commercial buildings differ from residential ones?
Both serve as water control valves, but commercial plumbing valves are often larger, flanged or grooved, built for higher flow, and testable or inspected on a schedule. Residential plumbing valves are usually smaller threaded, sweat, or PEX valves for fixture shutoff, pressure reduction, and outdoor water.
What are the typical applications and trade-offs of butterfly, globe, and plug valves compared with ball valves?
Butterfly valves suit larger lines that need a compact quarter-turn valve. Globe valves suit throttling and balancing but add pressure drop. Plug valves provide quarter-turn shutoff, including gas service where listed. Ball valves remain common for tight shutoff on smaller lines. The application, not the valve type, decides the choice.
