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Pressure relief and back pressure valve
1. Using a 17-mm socket wrench, loosen and remove the adjustment screw (19)
along with the counter nut (20) and washer (21).
2. Loosen and remove the four regulating valve mounting bolts (18) with a 5-mm
Allen key.
3. Remove the regulating valve body (13).
4. Remove the spring assembly (spring (17), top seat (15) and bottom seat (14)).
5. Remove the diaphragm (16) from the block (1).
Inspect all parts and replace them if necessary.
To re-install the regulating valve, follow steps 1 through 5 in reverse order.
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