PVB

Question 1

check valve fails to hold 1psid

Answer 1

debris on sealing surface or guide surfaces

damaged seat disc

weak or broken spring

Question 2

poppet fails to open at 1psid

Answer 2

debris restricting free operation

poppet seat adhering to bonnet

weak spring load

Question 3

minor leakage through air vent

Answer 3

damaged popped seal

cracked or damaged poppet

cracked bonnet or damaged sealing edge

debris on sealing surface

Question 4

significant discharge thru air vent

Answer 4

poppet not properly guided

major poppet or seal failure

low downstream pressure

insufficient inlet volume to operate device