Figure 6-25. Pressure relief valve disassembly.

Figure 6-25. Pressure relief valve disassembly.

(2) Pressure control value inspection and

repair. Inspect valve housings and pistons for

nicks, burrs, or pitting. Inspect the valve body land

e d g e s for wear caused by recirculating of abrasive

particles. Light scratches and light grey wear

a p p e a r a n c e are not detrimental to valve. Replace

all springs when reconditioning a valve with ap-

preciable service hours. Valves must move freely in

housings. Be sure slug (10, fig. 6-26), is free to

move in relief valve piston (15). Inspect pistons (6)

a n d (15) to make certain orifices are open. Check

drain hole in stop (9) to be sure it is open. Install

new preformed packings when assembling control

valve.

Figure 6-26. Pressure control value assembly.