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SYMPTOMPROBABLE CAUSEREMEDY
Fails to open when deliver pressure lowers
No Spring compressionTighten adjusting screw
Damaged springDisassemble and replace
Spring guide(8) is not in placeAssemble properly
Yoke dragging on inlet nozzleDisassemble and reassemble properly (refer to Reassembly)
Fails to close when delivery pressure rises
Spring compressed solidBack off adjusting screw
Mechanical obstructionDisassemble and reassemble properly (refer  to Reassembly) 
Worn discDisassemble remove and replace disc retainer assembly
Yoke dragging on inlet nozzleDisassemble and reassemble properly (refer  to Reassembly)
Leakage from cover vent hole
Damaged diaphragmDisassemble and replace
Loose diaphragm nutRemove cover and tighten nut


DESCRIPTION

The SHSUOTE mode SlcRD pressure reducing control automatically reduces

a higher inlet pressure to a lower outlet pressure. lt is a direct acting, spring loaded ,diaphragm type control that operates hydraulically or pneumatically. It may be used as a self-contained valve or as a pilot control for a Cla-Val main valve. lt will hold a constant downstream pressure within very close pressure limits.


OPERATlON

The SCRD Pressure Reducing control is normally held open by the force of the compression spring above the diaphragm ;and delivery pressure acts on the underside of the diaphragm. Flow through the valve responds to changes in downstream demand to maintain a pressure.


INSTALLATION

The SCRD Pressure Reducing control maybe installed in any position. There is one inlet port and two outlets ,for either straight or angle installation  .The second outlet port can be used for a gage connection. A flow arrow is marked on the body casting.


ADJUSTMENT PROCEDURE

The SCRD Pressure Reducing control can be adjusted to provide a delivery pressure range as specified on the name plate. 

Pressure adjustment is made by turning the adjustment screw to vary the spring pressure on the diaphragm. The greater the compression on the spring the higher the pressure setting.

1 . Turn the adjustment screw in(clockwise )to increase delivery pressure.

2 . Turn the adjustment screw out(counter-clockwise)to decrease the delivery pressure.

3 . When pressure adjustment is completed tighten jam nut on adjusting screw and replace protective cap.

4 . When this control is used ,as a pilot control on a SHSUOTE main valve,the adjustment should be made under flowing conditions. The flow rate is not critical but generally should be some what lower than normal in order to provide an inlet pressure several psi higher than the desired setting.


The approximate minimum low rates given in the table are for the main valve.


Valve Size
1 1/4"-3"4"-8"10"-16"
Minimum Flow GPM15-3050-200300-650



MAINTENANCE

Disassembly

To disassemble follow the sequence of the item numbers assigned to parts in the sectional illustration.

Reassembly

Reassembly is the reverse of disassembly. Caution must be taken to

avoid having the yoke (17) drag on the inlet nozzle of the body (18).

Follow this procedure:

1. Place yoke (17 ) in body and screw the disc retainer assembly (16) until 

it bottoms.

2. Install gasket (14) and spring (19) for 2-30 and 2-6.5 psi range on to plug 

(13) and fasten into body. Disc retainer must enter guide hole in plug as it is assembled. Screw the plug in by hand. Use wrench to tighten only.

3. Place diaphragm (12) diaphragm washer (11) and belleville washer (20) on yoke. Screw on hex nut (10).

4. Hold the diaphragm so that the screw holes in the diaphragm and body align. Tighten diaphragm nut with a wrench. At the final tightening release the diaphragm and permit it to rotate 5°to 10°. The diaphragm holes should now be properly aligned with the body holes. 



To check for proper alignment proceed as follows:

Rotate diaphragm clockwise and counterclockwise as far as possible.

Diaphragm screw holes should rotate equal distance on either side of

body screw holes±1/8".

Repeat assembly procedure until diaphragm and yoke are properly

aligned. There must be no contact between yoke and body nozzle during its normal movement. To simulate this movement hold body and diaphragm holes aligned. Move yoke to open and closed positions. There must be no evidence of contact or dragging.

5. Install spring (9) with spring guide (8).

6. Install cover (5),adjusting screw (2) and nut (3), the cap(1).








Pilot system specifications

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