Article IntroductionAfter the release and implementation of the new national standard (GB 5749-2022), two odor and taste indicators, namely 2-Methylisoborneol (2-MIB) and Geosmin, have become mandator...
23 Jun,2026
JieKeLong's foot valves are designed for priming maintenance and backflow prevention in pump suction systems. Key applications include well water extraction pumps, agricultural irrigation suction lines, firefighting water sources, industrial sump lift stations, and marine bilge pumping systems. They play an essential role in ensuring suction line integrity and preventing prime loss during pump shutdown across fluid transfer operations.
Foot valves enable reliable priming retention via spring-assisted disc or flapper mechanisms.
They provide automatic backflow prevention when pumps shut down, preventing prime loss and pump dry-run damage.
Minimal flow resistance in fully open position due to wide-passage strainer screens and unhindered flap design.
Robust stainless-steel strainers ensure debris tolerance and corrosion resistance in submerged suction environments.
Prepare suction pipe ends with clean, square-cut surfaces. Apply thread sealant or Teflon tape to male tapered threads (BSPT/NPT). Inspect strainer screens for debris damage and ensure check mechanism moves freely.
Install valve vertically with strainer facing downward below fluid level. Hand-tighten threaded joints, then wrench-tighten 1.5-2 turns. For flanged types, align gaskets and torque bolts in star pattern. Never wrench the strainer cage – apply force only to valve body hex points.
Maintain minimum 5x pipe diameter straight run before valve inlet. Over-tightening may crack the valve housing or distort the flap seat, causing priming failure. Under-tightening risks air suction leaks. Conduct prime retention test post-installation by verifying pump restart without repriming.
Fluid flow upward during pump operation lifts the disc/flapper off the seat, permitting unimpeded suction flow through the strainer screen.
When flow stops, gravity or spring force drives the disc vertically against the seat, creating a seal that blocks backflow and retains prime in the suction line.
Sealing effectiveness relies on hydraulic pressure differentials, with reverse pressure enhancing seal integrity by forcing the disc tighter against the seat.
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