These spring-operated poppet valves, with optional relief settings, allow free flow in only one direction and prevent backflow – sometimes referred to as “backflow preventor”, “flow stop”, or “non-return” valve. They also are used for relief and by-pass functions; however, they should not be used as safety relief valves. Kepner's Flexible Seal Seat™ combines metal-to-metal contact with a resilient seal seat ensuring dependable bubble-tight shutoff of liquid or gas, and long service life. Standard and specialty valve designs handle a wide variety of applications.
Unit of Measure

Specifications

Body Materials

N/A 303 Stainless Steel 316 Stainless Steel Aluminum Brass Standard Steel
O-Ring Seals1 N/A Buna-N EP Neoprene Viton®
Temperature2 N/A -300 to 450 ºF-184 to 232 ºC

Crack Pressure Ranges

N/A 1 to 2 psi0.07 to 0.14 bar

Relief / Check Crack Pressures

N/A 5 psi10 psi25 psi50 psi65 psi0.35 bar0.7 bar1.7 bar3.5 bar4.5 bar

Max. Operating Pressure

N/A 3000 psi207 bar

Max. Flow

N/A 500 gpm1893 lpm

A - Total Length

N/A 3.880 in

B

N/A 0.790 in

C

N/A 3.09 in

D

N/A 0.340 in

E

N/A 1.030 in

F Hex

N/A 1 1/8 in

G - End Connections

N/A 1/2 MPT

H - End Connections

N/A 1/2 FPT

Features and Benefits

N/A
- Flexible Seal Seat™ for zero leak (bubble-tight) seal at low and high pressures
- O-Ring seal positively secured
- Non-pressurized threads
- Poppet stop inside valve body prevents spring from bottoming out
- Generous flow passages allow full flow with minimal pressure drop

  • 1 Other materials available
  • 2 O-Ring dependent