Dixon Sanitary HSC Spring Check Valve Repair kits are available in either FKM or EPDM. 1/2" & 3/4" kit includes one Body Gasket, one Plunger O-Ring, and one Spider O-Ring. 1" and larger repair kits contain one Body Gasket and one Plunge O-Ring.

Disassembly

• WARNING: Relieve fluid pressure in the line before disassembling the valve. Do use caution and wear protective clothing if spring check valve has been used in applications using acids or other chemicals that may be harmful.
• 1. Loosen the wing nut and remove the body clamp (6) from the center of the valve.
• 2. Carefully separate the body halves.
• 3. Lift off the upper body (7). For 1/2" and 3/4" sizes, remove spider (8) and spider O-ring (9).
• 4. Remove the spring (4) and the plunger (3).
• 5. If necessary, remove the plunger O-ring (2) using a small screwdriver. Be careful as to not damage the plunger or O-ring.

Assembly

• 1. Place the body halves on a flat surface with clamp ends down.
• 2. Carefully slide plunger O-ring (2) into the plunger O-ring groove.
• 3. Set the plunger (3) down onto the sealing surface of the lower body.
• 4. Slide the spring (4) down onto the plunger stem.
• 5. Place body gasket (5) on lower body (1).
• a. For 1/2" and 3/4" sizes:
• i. Install spider O-ring (9) in upper body (7).
• ii. Install spider (8), with plunger bushing facing up, in upper body (7).
• iii. Set body gasket (5) on upper body (7).
• 6. Slide upper body spider bushing over plunger stem and compress the spring until body halves and gasket meet.
• a. For 1/2" and 3/4" sizes:
• i. Grab upper body, spider O-ring, spider, and body gasket and slide spider onto plunger compressing the spring until body halves and gasket meet.
• 7. While holding the body halves together, put body clamp around the center of the valve body and tighten wing nut.