Parker Hannifin Corporation
Instrumentation Valve Division
Jacksonville, Alabama
MI-137
3
Figure 4: RL Series Relief Valve with Manual Override Exploded View
Setting Desired Cracking Pressure
1. Rotate the Cap to set the desired cracking pressure.
2. Tighten the Lock Nut against the Cap.
f required, secure the pressure setting by using the Lockwire to fasten the Cap and Valve Body together.
REASSEMBLY
MAKE CERTAIN T AT ALL PARTS ARE FREE OF DIRT OR OT ER CONTAMINANTS BEFORE REASSEMBLY.
1. Place the Teflon coated O-ring onto the Lower Ste and the O-ring and Back-up ring onto the Body Bonnet as
shown in the section titled O-Ring/Back-up Ring Insertion .
2. Insert the Lower Ste into the Body Bonnet being careful not to da age the O-ring or Back-up Ring.
3. Thread the Upper Ste / Manual Upper Ste onto the Lower Ste and torque to 12 in-lbs by gripping the Lower
Ste with a pair of pliers and rotating the Upper Ste clockwise with a 7/16 inch hex socket torque wrench. (Do
not cla p over the cri ped portion of the Lower Ste .)
4. Insert the asse bly fro 4 into the Valve Body being careful not to da age the O-ring and Back-up Ring.
5. Apply a liberal a ount of lubricant, as consistent with the Valves service require ents, onto the body ste end
threads.
6. Install the Bonnet onto the Valve Body and torque to 30 ft-lbs by turning clockwise with a 7/8 inch hex socket
torque wrench.
7. Place a PTFE Washer into the bore of the Bonnet, insure that the washer is lying flat against the face of the Upper
Ste /Manual Upper Ste .
8. Place the Spring into the bore of the Bonnet.
9. Place the other PTFE Washer onto the top of the Spring.
10. Place an appropriate lubricant, consistent with the valves service require ents, on the internal threads of the Cap.
11. Thread the Cap onto the Bonnet. Insure that the washer re ains atop the Spring during thread engage ent.
12. If your syste de ands, lock the Cap in place by holding it with a 7/8 inch wrench and turning the Locknut counter-
clockwise until it is snug against the Cap.
13. If the valve has a Manual Upper Ste , thread the Handle onto it.
