Cleaning & Inspection

8.Vertical check valve models: Remove the retaining ring (25) that secures the delivery check valve assembly in the end cover (6). Remove and separate the perforated plate (26), spring (27), check valve body (28) and o-ring

9.Horizontal check valve models: Remove delivery check valve plug (34) that secures the check valve assembly in the end cover (6). Remove the spring (35), check valve (36) and o-ring (2).

10.Remove the retaining ring (30) that secures the heater and thermostat assembly (31) in the end cover (6). Gently pull the heater and thermostat (31) out of the end cover

(6)and remove the o-ring (32).

11.Using a 9/16” wrench, remove the safety valve assembly

(33)from the end cover (6).

1.Using mineral spirits or an equivalent solvent, clean and thoroughly dry all metal parts except the desiccant cartridge.

2.Inspect the interior and exterior of all metal parts that will be reused for severe corrosion, pitting and cracks. Superficial corrosion and or pitting on the exterior portion of the end cover is acceptable.

3.Inspect the bores of both the end cover and the purge valve housing for deep scuffing or gouges.

4.Make certain that all purge valve housing and end cover passages are open and free of obstructions.

5.Inspect the pipe threads in the end cover. Make certain they are clean and free of thread sealant.

6.Inspect the purge valve housing bore and seats for excessive wear and scuffing.

7.Inspect the purge valve piston seat for excessive wear.

8.Make certain that the purge orifice in the cartridge bolt is open and free of obstructions.

9.Inspect all air line fittings for corrosion. Clean all old thread sealant from the pipe threads.

10.All o-rings removed should be discarded and replaced with new o-rings provided in appropriate kit(s).

ASSEMBLY

Prior to assembly, coat all o-rings, o-ring grooves, and bores with a generous amount of silicone grease. (Refer to Figures 9 and 10 during assembly unless otherwise advised.)

1.Install the quad ring (21) in its groove on the O.D. of the purge piston (20). Place the return spring (22) in the bore of the purge valve housing (19), then insert the purge piston (20) into the I.D. of the spring (22).

2.Install and center the exhaust diaphragm (17) over the shoulder bolt (16) making certain that the diaphragm ID is over the bolt shoulder. Then install the purge valve

(18)on the shoulder bolt making certain its metal support side is against the diaphragm (17).

3.Push the purge piston (20) into the housing (19) until it bottoms and insert a large blade screw driver in the piston’s slotted head. While depressing the purge piston with the screw driver, install the shoulder bolt (16) with exhaust diaphragm (17) and purge valve (18) in the piston. Torque the shoulder bolt (16) to between 60-80 in. lbs.

4.Install the two o-rings (23 & 24) on the purge valve housing

(19)placing each in its appropriate location. DLU models do not contain o-ring (23). Install the assembled purge valve housing in the end cover (6) while making certain the purge valve housing is fully seated against the end cover. Secure the purge valve housing in the end cover using the retaining ring (14). Make certain the retaining ring is fully seated in its groove in the end cover (6).

5.Using a 9/16” wrench, install the safety valve assembly

(33)into the end cover (6).

6.Vertical check valve models: Install the o-ring (29) on the check valve body (28) and push the o-ring down, over the 3 guide lands until it is in the o-ring groove of the check valve body (28). Install the check valve spring

(27)on the check valve body so that the small coils of the spring slip over the check valve body. Install the assembled check valve body, o-ring, and spring (27, 28 & 29) in the end cover (6) so that the o-ring rests on its seat in the end cover (6) and the spring is visible. Install the perforated plate (26), in the end cover (6) and secure the check valve assembly using the retaining ring (25). Make certain the retaining ring is fully seated in its groove in the end cover (6).

7.Horizontal check valve models: Install o-ring (2) onto check valve (36). Place the check valve in the delivery check valve port of the end cover (6). Install the spring

(35)over the delivery check valve (36) and secure with the delivery check valve plug (34).

8.Install the o-ring (32) on the heater and thermostat assembly (31). After making certain the sponge rubber cushion is positioned between the connector body and thermostat, gently push the heater and thermostat assembly (31) into the end cover (6), making certain the heating element enters the small diameter bore in the larger heater and thermostat bore in the end cover

(6).Secure the heater and thermostat assembly in the body using the retaining ring (30). Make certain the retaining ring is fully seated in its groove in the end cover

9.Install both o-rings (12 & 13) on the desiccant cartridge bolt (10) and using a twisting motion, insert the assembled desiccant cartridge bolt in the end cover (6).