- Check & Vent Valves



Check valves should be used whenever there is a need to prevent back-flow of process media. This may be when two incompatible fluids cannot be allowed to mix, or when reverse flow would cause undesirable drainage of a system line or tank. Many styles exist including: simple ball checks, heavy duty swing checks, and highly efficient piston checks. These valves are typically gravity operated and require very little back pressure to seal. Air release valves safely allow any entrapped air or gas to escape, avoiding damage to the piping system.


As one of the most requested styles of check valves for smaller diameter plastic piping systems, these valves feature a true union design for simple maintenance. Full length guide ribs allow for maximum flow and minimum turbulence, preventing ball sticking and chatter. Very low back pressure is needed for positive shut off. The VB is available in PVC with either EPDM or Viton seals, and CPVC with Viton seals.

Pressure: 150 PSI at 73°F
Sizes: 1/2' – 4'


The VR features an all PVC construction of high performance components. This Y-pattern valve will perform equally as well in both vertical and horizontal orientations. With an increased flow rate yet low-return pressure positive seal, and top-entry maintenance, our VR piston check valve far exceeds the limited performance of other popular check valves. Both EPDM and Viton seals are available.

Pressure: up to 232 PSI depending on the size
Sizes: 1/2' – 4'


The SC combines superior flow rate with maximum versatility. With stainless wetted parts and hardware, top entry design, and extremely low back pressure requirements, these flanged valves are the perfect choice for back-flow prevention in large diameter lines, both vertical and horizontal. The SC is available in PVC with either EPDM or Viton seals.

Pressure: up to 100 PSI at 73°F depending on the size
Sizes: 3' – 8'


The VA is one of only two such plastic valves in the industry, and the only one controlled by media and not pressure. Designed for tanks, slurries, or start-ups, the VA valve will economically and efficiently eliminate air or gas pockets as well as break potentially dangerous vacuums. This no-spill valve is offered in PVC with EPDM seals. Viton sealing kits are also available.

Pressure: 232 PSI
Sizes: 3/4', 1-1/4' and 2'

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