Graco 307212ZAC important safety instructions Service of the Spring Operated Regulators

Service

Service of the Spring Operated Regulators

WARNING

To reduce the risk of serious injury whenever you are instructed to relieve pressure, always follow the Pressure Relief Procedure on page 8.

1.Shut off the pump.

2.Close the ball valve at the regulator’s fluid inlet. See Fig. 1.

3.Release all fluid pressure in the regulator and disconnect the fluid line.

4.Remove the regulator from the system.

5.Remove the swivel union (23) and spring (40) from the regulator body.

6.Remove the ball (20), valve seat (16), and gasket (15). See Fig. 5.

CAUTION

Use special care when handling the hard carbide ball (20) and seat (16) to avoid damaging them.

NOTE: Gasket (15) is thin and translucent. Be sure to remove the gasket.

7.Remove the six cap screws (1) and housing (6).

8.Remove the cap (7), adjusting screw (12) and spring (5).

9.Place diaphragm assembly in a vise, with jaws on stem housing (18). Remove the stem retaining screw (10), jam nut (13), and washer (17) from the stem housing (18).

10.Remove the diaphragm (25) – on Models 217314 and 221118 only, diaphragm (22), and gasket (26).

11.Remove the spring (3), valve stem (9) and gasket (21) from the stem housing.

12.Thoroughly clean and inspect all parts. Replace any parts that appear to be worn or damaged.

13.Place stem housing (18) in a vise. One at a time, place the gasket (26), diaphragm (22) – white PTFE side down toward bottom housing, dia- phragm (25) – on Models 217314 and 221118 only, and washer (17) on the stem housing (18). Secure them with the jam nut (13).

NOTE: On Models 217314 and 221118, align the holes on the diaphragms (25 & 22) before tightening the jam nut (13).

14.Torque the jam nut (13) onto the stem housing (18) to 21–35 ft-lb (28–47 NSm).

15.Install the valve stem (9), spring (3), gasket (21) and retaining screw (10) in the stem housing (18). Make sure the tab on the valve stem (9) fits into the slot on screw (10).

16.Torque the retaining screw (10) into the housing to 21–25 ft-lb (28–34 NSm).

17.Install the spring, adjusting screw (12) and cap on the housing (6). Tighten six capscrews (1) in the sequence shown in Fig. 5, Bottom View, and to the torque noted.

18.Install the gasket (15), valve seat (16), and ball (20) into the housing (6).

NOTE: Seat may be turned upside down and reused.

19.Screw the swivel union (23), with the o-ring (4) attached and the spring (40) in place, into the inlet. Torque to 23–27 ft-lb (31–36 NSm).

14 307212