Technical Foundation
What Is a Check and Foot Valve?
A check valve is a one-way valve that allows flow in a single direction and automatically closes to prevent reverse flow, protecting pumps from backspin and reverse pressure surge and preventing backflow contamination between systems. Swing check valves use a hinged disc that swings open with forward flow and closes by gravity and reverse flow pressure — suited to horizontal lines and larger sizes, but prone to slam if flow reverses abruptly. Spring-loaded check valves (including wafer and ball styles) use a spring to hold the closing element seated, giving faster, more positive closure and making them suitable for vertical installation, unlike a plain gravity swing check.
A foot valve is a specialized check valve installed at the submerged inlet end of a pump suction line, combining a check valve with a strainer — it keeps the suction line and pump primed by preventing water from draining back into the source when the pump stops, which would otherwise require re-priming before every restart, and the strainer screens out debris that could damage the pump. Cracking pressure (the minimum upstream pressure needed to open the valve) and body material must be matched to the system's operating pressure and process media.
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| Spec | What It Means | Why It Matters |
|---|---|---|
| Valve Type | Swing, spring/wafer, ball, lift, foot valve | Spring types close faster and suit vertical lines; swing types suit horizontal, lower-cycling applications |
| Cracking Pressure | Minimum pressure to open, e.g. 1/3 PSI, 1 PSI | Too high a cracking pressure wastes pump head; too low risks chatter in low-flow conditions |
| Connection Size & Type | NPT threaded, flanged, wafer/lug | Must match the mating pipe and be rated for the system's pressure class |
| Body Material | Bronze, cast iron, PVC, stainless steel | Must be chemically compatible with the process media and suited to the pressure/temperature rating needed |
| Orientation Rating | Horizontal-only vs. any orientation | A swing check installed vertically may not close reliably by gravity alone — verify orientation rating |
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Applications
Where Check and Foot Valves Get Used
Check and foot valves are specified wherever reverse flow needs to be prevented, or a pump suction line needs to hold prime.
Well & Booster Pump Suction Lines
Foot valves maintaining prime on submerged suction lines so the pump doesn't need re-priming on every start.
Municipal & Process Water Distribution
Swing check valves preventing backflow into upstream mains when downstream pressure exceeds supply pressure.
Irrigation Systems
Check valves protecting pump systems from backflow and preventing drainback between irrigation cycles.
HVAC Hydronic Systems
Spring check valves on pump discharge lines preventing gravity circulation and reverse flow when pumps cycle off.
Fire Protection Systems
Check valves preventing backflow between fire sprinkler systems and the potable water supply.
Chemical & Process Piping
Material-matched check valves (PVC, stainless) preventing reverse contamination between process fluid streams.
FAQ
Check and Foot Valves Questions, Answered
What's the difference between a swing check valve and a spring check valve?
A swing check valve uses a hinged disc that opens with forward flow and closes by gravity plus reverse flow pressure, which works reliably in horizontal lines but can slam shut abruptly on sudden flow reversal and generally isn't suited to vertical installation since gravity alone may not seat the disc reliably. A spring check valve uses a spring to actively hold the disc or ball seated, closing faster and more positively, and can typically be installed in any orientation including vertical lines.
Why does my pump lose prime even though I have a foot valve installed?
A foot valve that's worn, has debris caught in the seat, or has a strainer clogged enough to restrict flow can fail to seal fully, letting the suction line drain back between pump cycles — inspect the valve seat for wear or debris, and confirm the valve is rated for the suction lift and pipe size in use, since an undersized or degraded foot valve is the most common cause of repeated prime loss.
What does 'cracking pressure' mean and why does it matter?
Cracking pressure is the minimum upstream pressure required to unseat the valve and allow flow to begin. A cracking pressure that's too high wastes pump head and reduces system efficiency, while one that's too low can allow the valve to chatter (rapidly open and close) under low or fluctuating flow, causing noise and premature wear — select a cracking pressure appropriate to the system's actual operating pressure range.
Can a check valve be installed in a vertical pipe run?
Only if it's specifically rated for vertical installation — many swing check valves rely on gravity to help close the disc and are only rated for horizontal flow, while spring-loaded and wafer-style check valves use spring force rather than gravity and are generally rated for any orientation, including vertical flow (check the specific valve's orientation rating before installing).
What body material should I use for a check valve in a potable water system?
Bronze or lead-free brass check valves are standard for potable water applications to meet NSF/ANSI 372 lead-free requirements, while cast iron is common for larger non-potable water and fire protection lines, and PVC or CPVC is used for chemical and corrosive process applications where metal wetted parts would corrode. Match the body material to both the media and any applicable plumbing code requirements.
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