Suction and Discharge Gate Valves

clearance between impeller face and

(1) Install the eight studs (13), eight studs

wear

plate

face

should

(14), four studs (48), reducer bushing (46) and drain

approximately .008 to .015 inches. If

cock (43) on the volute casing (49).

rubbing occurs, two volute gaskets

(2) Install the wear plate (15) and secure with

(21) will be required and additional

two lock-washers (11) and nuts (10).

shims (18) must be added between

impeller (17) and sleeve (23) to get

NOTE

proper clearance between impeller

On model US36ACG. the wear plate

face and wearplate face.

(15) is secured with two flat head

machine screws.

(4) Install the engine and pump assembly

(para 5-5 and 5-6).

(3) Install the small valve weight (5) and large

6-5. Suction and Discharge Gate Valves

valve weight (7) on the flap valve gasket (6), secure

with two lock-washers (8) and screws (9).

a. Removal. Refer to paragraph 4-26 and remove

NOTE

the suction and discharge gate valves.

On model US36ACG, two nuts (4) are

b. Disassembly.

Refer to figure 6-2 and

used with the screws (9) and

disassemble the suction and discharge gate valves.

lockwashers (8) that secure the large

c. Cleaning, Inspection, and Repair.

valve weight (7) and small valve

weight (5) to the flap valve gasket (6).

(1) Wash all parts with cleaning solvent-

PD680. Dry thoroughly.

(4) Install the flap valve assembly (3) and the

suction adapter (2), secure with four nuts (1) to the

(2) Inspect body for cracks and breaks.

volute casing (49).

Inspect valve seats for pitting, grooves, cracks, and

excessive wear. If seats are slightly pitted, dress up

e. Installation.

with emery cloth. Clean surfaces evenly to assure

proper seating of the disc.

(1) Position gasket (21) on volute casing (49).

(3) Inspect discs for wear and damage.

(2) Aline the volute casing (49) against the

intermediate housing (35) carefully. Do not damage the

(4) Inspect valve stem for bends and thread

gasket (21) impeller (17) or studs (14).

damage.

(3) Secure the volute casing

the

(5) Replace a defective part.

intermediate housing with eight nuts (37).

(6) Discard gasket and packing.

NOTE

d. Reassembly.

On model US36ACG, lockwashers

are used with the eight nuts (37) that

(1) Refer to figure 6-2 and reassemble the

secure the volute casing (49) to the

suction and discharge gate valves.

intermediate housing (35).

(2) Use new gasket and packing during

CAUTION

reassembly.

When tightening the first two nuts,

e. Installation. Refer to paragraph 4-26 and install

rotate the impeller shaft to determine

the suction and discharge gate valves.

the possibility of the impeller

rubbing on wear plate. With all nuts

tight,

6-4