Sandpiper S15 Non-Metallic User Manual download pdf (Page 31)

520-193-000 9/02 Model S15 Non-Metallic Design Level 2 Page 29

Modular Check Valve Drawing

MODULAR CHECK VALVE

SERVICING

Before servicing the check valves, first

shut off the suction line and then the

discharge line to the pump. Next, shut

off the compressed air supply, bleed air

pressure from the pump, and disconnect

the air supply line from the pump. Drain

any remaining fluid from the pump. The

pump can now be removed for service.

To access the modular check valve,

remove the elbows (items 19 from pump

composite repair parts drawing). Use a

9

/

16

" wrench or socket to remove the

fasteners. Once the elbows are removed,

the modular check valves can be seen

in the cavities of the outer chamber

(items 14).

Next remove the check valve seal

(item 34). Inspect the seal for cuts or

pinched areas. Replace seal as needed.

Disassemble the component parts of

each modular check valve. Inspect the

check valve retainer (item 30) for cuts,

abrasive wear, or embedded materials.

Replace as needed.

Inspect the check balls (items 3) for

wear, abrasion, or cuts on the spherical

surface. The check valve seats (items

36) should be inspected for cuts, abrasive

wear, or embedded material on the

surfaces of both the external and internal

chamfers. The spherical surface of the

check balls must seat flush to the

surface of the inner chamfer on the check

valve seats for the pump to operate to

peak efficiency. Replace any worn or

damaged parts as necessary.

Remove the remaining check valve

seal (item 34). Inspect the seal for cuts

or pinched areas. Replace seal as

needed.

Re-assemble the modular check

valve. The seat should fit snugly into the

retainer.

Place a check valve seal (item 34)

into the cavity of the outer chamber (item

14). Make sure the chamfer side of the

seal faces out. Insert the modular check

valve into the outer chamber with the

retainer facing up. Install a check valve

seal (item 34). Make sure the chamfer

side of the seal faces the chamfer on

the check valve seat or retainer.

The pump can now reassembled,

reconnected and returned to operation.

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