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Type 75A

D100254X012

Instruction Manual

Form 511

September 2009

www.emersonprocess.com/regulators

Type 75A Water Pressure Regulator

Application

The Type 75A is designed to reduce domestic or

industrial water pressures to a constant pressure,

thus protecting plumbing xtures and meters from

high-pressure surges. As shown in Figure 1, it is self-

contained, requiring no external control line

for operation.

Installation

Check the unit for shipment damage. Clean all foreign

material from the pipelines and regulator interior.

Install the Type 75A in a horizontal line with the spring

case above or below the line, and with ow through

the regulator as indicated by the arrow cast on the

body. Coat the external threads with pipe compound

and draw up the connections tightly but not severely.

If a snap-acting valve (solenoid valve) is used in the

system, the snap-acting valve should be installed

upstream of the Type 75A. The Type 75A may be

damaged by high shutoff pressure if a snap-acting

valve is installed downstream.

Adjustment

One spring for each size regulator allows operation

over an outlet pressure range of 20 to 80 psi (1,4 to

5,5 bar). Maximum inlet pressure is 200 psi (13,8 bar).

Minimum operating differential pressure is 5 psi (0,34 bar).

To change the reduced pressure, loosen the adjusting

screw locknut (key 9) and turn the adjusting screw

(key 8) into the spring case to increase the reduced

pressure, or out of the case to decrease it. Re-tighten

the locknut.

W0057-1

Figure 1. Type 75A Water Pressure Regulator

Maintenance

To replace the valve disk (key 13), unscrew the guide

plug (key 3) from the body. The valve disk holder

(key 5) may now be unscrewed from the yoke (key 4). Be

careful not to twist and rupture the diaphragm (key 12).

1 2 3 4

Type 75A 1

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Strona 1 - Type 75A

Type 75AD100254X012Instruction ManualForm 511September 2009www.emersonprocess.com/regulatorsType 75A Water Pressure RegulatorApplicationThe Type 75A i

Strona 2

Type 75A2NoteA piece of hex bar stock can be drilled out and slipped over the disk holder shaft to t inside the holder. This simplies removal of th

Strona 3

Type 75A3NPS 2 (DN 50) BODY NPS 2-1/2 (DN 65) BODY89101127141561214191651317330A5582-AA0211Figure 2. Type 75A Assemblies (continued)APPLY GASKALACKey

Strona 4

Type 75AThe Emerson logo is a trademark and service mark of Emerson Electric Co. All other marks are the property of their prospective owners. Fisher

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