DISASSEMBLY – RELIEF VALVE

Mark the valve and head before disassembly to insure proper reassembly.

1.Remove the valve cap.

2.Measure and record the length of extension of the adjusting screw. Refer to “A” on Figure 22.

3.Loosen the locknut and back out the adjusting screw until spring pressure is released.

4.Remove the bonnet, spring guide, spring and poppet from the valve body. Clean and inspect all parts for wear or damage and replace as necessary.

ASSEMBLY – RELIEF VALVE

Reverse the procedures outlined under DISASSEMBLY

–RELIEF VALVE. If the valve is removed for repairs, be sure to replace in the original position. The relief valve adjusting screw cap must always point towards the suction side of the pump. If the pump rotation is reversed, remove the relief valve and turn end for end. Refer to Figure 3, page 3.

DANGER!

Before starting pump, be sure all drive equip- ment guards are in place.

Failure to properly mount guards may result in serious injury or death.

PRESSURE ADJUSTMENT

If a new spring is installed or if the pressure setting of the pressure relief valve is to be changed from that which the factory has set, the following instructions must be carefully followed.

1.Carefully remove the valve cap, which covers the adjusting screw.

2.Loosen the locknut, which locks the adjusting screw so pressure setting will not change during operation of pump.

3.Install a pressure gauge in the discharge line for the actual adjustment operation.

4.Turn the adjusting screw in to increase pressure and out to decrease pressure.

5.With discharge line closed at a point beyond the pressure gauge, gauge will show the maximum pressure valve will allow while the pump is in operation.

IMPORTANT

When ordering parts for the pressure relief valve, always give the model number and serial number of the pump as it appears on nameplate and name of the part wanted. When ordering springs, be sure to give pressure setting desired.

FIGURE 22

VALVE – AS, AK, AL, KE and KKE SIZES

 

 

VALVE - LIST OF PARTS

 

1.

Valve Cap

 

6.

Valve Body

2.

Adjusting Screw

 

7.

Valve Spring

3.

Lock Nut

 

8.

Poppet

4.

Spring Guide

 

9.

Cap Gasket

5.

Bonnet

 

 

 

 

table 8

SECTION TSM 685.2 ISSUE C

PAGE 14 OF 16

 

 

Page 13 Page 15
Page 14
Image 14
Viking 855 service manual Disassembly Relief Valve, Valve AS, AK, AL, KE and KKE Sizes
Page 13 Page 15

855 specifications

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