Service Manual User guide

MAINTENANCE PROCEDURES LOAD CHECK VALVES

C. LOAD CHECK VALVES

Load check valves used on HUSCO control valves normally do not require servicing; malfunction is usually

the result of foreign matter lodging between the seat and poppet.

DISASSEMBLY

Remove valve plug, poppet spring and poppet.

INSPECTION AND REPAIR

Clean parts with solvent and blow dry with compressed air. Examine poppet and poppet seat for nicks

or scratches. Minor nicks or scratches can be removed by lapping poppet and seat with a fine grade lapping

compound.

CAUTlON: DO NOT ALLOW LAPPING COMPOUND TO REMAIN IN VALVE.

Replace O-ring if damaged or deteriorated. Replace spring if weak or distorted.

ASSEMBLY

Assemble poppet and poppet spring to housing. Replace O-ring to valve plug to

housing.

Load Check Valve

FIGURE 28