Bell & Gossett V57050B SRS Pneumatic Purge Valve User Manual

Page 4

DIAPHRAGM REPLACEMENT (See Figure 6)

Required parts: EPDM screwed-in diaphragm part no. V57051
1. Turn valve to stand on the cover

2. Unfasten the 4 body screws

3. Remove body

and screws

4. Unscrew and remove old/defective diaphragm

5. Slightly grease screw threads in the actuator housing

(

NOTE: use lithium grease ZETGE M 51)

6. Align the diaphragm with the actuator. Mold seam of dia-

phragm must be perpendicular to the flow direction.

7. Put body

back on. Press down on body to start screws

into the actuator thread.

8. Switch actuator on and off twice, fasten screws

cross-

wise in unpressurized condition (torque at 5 N-m).

9. Examine valve to make sure it is operating properly and

there are no leaks.

WARNING: System fluid under pressure and/or at

high temperature can be very hazardous. Before ser-

vicing, reduce system pressure to zero or close the up-

stream shutoff valve (See No. 4 Installation Instruction

Section). Leave purge valve in open position, and allow

system fluid trapped between the shutoff valve and the

drain to drain completely. Failure to follow these instruc-

tions could result in serious personal injury or death and

property damage.

CAUTION: Diaphragm and all diaphragm connecting

parts must be kept free of petroleum based lubricat-

ing fluids and greases.

Figure 6

Xylem Inc.

8200 N. Austin Avenue

Morton Grove, Illinois 60053

Phone: (847) 966-3700

Fax: (847) 965-8379

www.xyleminc.com/brands/bellgossett