Type 75A
Fisher Controls
Instruction Manual
Type 75A Water Pressure Regulator R
October 1990
Form 511
Application The Type 75A is designed to reduce domestic or industrial water pressures to a constant pressure, thus protecting plumbing fixtures 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 flow through the regulator as indicated by the arrow cast on the body. Coat the male threads with pipe compound and draw up the connections tightly but not severly. 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 shut-off pressure if a snap-acting valve is installed downstream.
W0057-1
Figure 1. Type 75A Water Pressure Regulator
One spring for each size regulator allows operation over an outlet pressure range of 20 to 80 psi (1.37 to 5.52 bar). Maximum inlet pressure is 200 psi (13.79 bar). Minimum operating differential pressure is 5 psi (0.34 bar).
Maintenance
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. Retighten the locknut.
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).
eFisher Controls International, Inc. 1945, 1990; All Rights Reserved
D100254X012
Adjustment
R
Type 75A Note A piece of hex bar stock can be drilled out and slipped over the disk holder shaft to fit inside the holder. This simplifies removal of the holder from the yoke. Use the following sizes of hex bar: 1/2-inch body - 7/8-inch hex; 3/4-inch body - 1-inch hex; 1 or 1-1/2-inch body - 1-1/4-inch hex; 2-inch body - 2-inch hex; 2-1/2-inch body 2-1/2-inch hex. To replace valve disk, unscrew the disk retaining screw (key 16), remove old disk (key 13), apply gasket sealer to new disk and install. To replace the diaphragm, first remove tension of the regulator spring (key 11) by turning out the adjusting screw (key 8). Remove the bolting that holds the spring case (key 2) to the body and lift off the casing and regulator spring. Unscrew the diaphragm nut (key 7) and diaphragm head (key 6). Replace the diaphragm.
Parts Ordering
20A5581-B A0209
When corresponding with your Fisher sales office or sales representative about this regulator, always reference the type number which is found on the nameplate (key 21). When ordering replacement parts, reference the key number of each needed part as found in the following parts list.
Parts List Key 1
2
3
2
Figure 2. Type 75A, 1/2, 3/4, 1 and 1-1/2 Inch body Key 4
5 Description
Body, bronze 1/2-inch 3/4-inch 1-inch 1-1/2-inch 2-inch 2-1/2-inch Spring Case, cast iron 1/2-inch 3/4-inch 1-inch 1-1/2-inch 2 and 2-1/2-inch Guide Plug, bronze 1/2-inch 3/4-inch 1-inch 1-1/2-inch 2-inch 2-1/2-inch
Part Number
2A9408 12012 2D2263 12012 2V3615 12012 3D1740 12012 3D6267 12012 3E2310 12012 1D8786 19042 000857 19042 2A4801 19042 3V3613 19042 001320 19042 0W0994 12012 1A9719 12012 1A9508 12012 1A9746 12012 1A9752 12012 0D0232 12012
6
7
8
Description Valve Yoke, bronze 1/2-inch 3/4-inch 1-inch 1-1/2-inch 2-inch 2-1/2-inch Valve Disk Holder, bronze 1/2-inch 3/4-inch 1-inch 1-1/2-inch 2-inch 2-1/2-inch Diaphragm Head 1/2-inch, steel 3/4-inch, cast iron 1-inch, cast iron 1-1/2-inch, cast iron 2 and 2-1/2-inch, cast iron Diaphragm Nut, steel 1/2-inch 3/4-inch 1-inch 1-1/2-inch 2 and 2-1/2-inch Set Screw, zinc plated steel 1/2-inch 3/4-inch 1 and 1-1/2-inch 2 and 2-1/2-inch
Part Number 1A9427 12012 1A9455 12012 1A9514 12012 2V3614 12012 2V3616 12012 2V3617 12012
1B5901 12012 1B5902 12012 1B8673 12012 1B8677 12012 1B8679 12012 1B8698 12012 1A9415 24092 1A9456 19042 1A9509 19052 1V3612 19042 1A9758 19042 1A9414 24092 1E4785 24092 1V3611 24092 1A9748 24092 1A9824 24092 1C2160 32992 1A5144 28992 1F5753 28992 1V3609 28982
Type 75A
30A5580-A A0212 30A5582-A A0211
Figure 3. Type 75A, 2-Inch Body
Key 9
10
11
12*
13*
Description Hex Nut, brass 1/2 and 3/4-inch 1 and 1-1/2-inc 2 and 2-1/2-inch Spring Seat, steel 1/2 and 3/4-inch 1-inch 1-1/2 to 2-1/2-inch Spring, spring wire 1/2-inch 3/4-inch 1-inch 1-1/2-inch 2 and 2-1/2-inch Diaphragm, neoprene 1/2-inch 3/4-inch 1-inch 1-1/2-inch 2 and 2-1/2-inch Valve Disk, nitrile 1/2-inch 3/4-inch 1-inch 1-1/2 and 2-inch 2-1/2-inch
*Recommended spare part.
Figure 4. Type 75A, 2-1/2 Inch Body
Part Number
Key
Description
14
Cap Screw, zinc plated steel 1/2-inch (6 req’d) 3/4-inch (6 req’d) 1-inch (8 req’d) 1-1/2-inch (8 req’d) 2-inch (10 req’d) 2-1/2-inch (4 req’d) Hex Nut, zinc plated steel 1/2-inch (6 req’d) 3/4-inch (6 req’d) 1 and 1-1/2-inch (8 req’d) 2-inch (10 req’d) 2-1/2-inch (6 req’d) Machine Screw, brass 1/2-inch 3/4 and 1-inch 1-1/2 and 2-inch 2-1/2-inch Disk Retainer Washer, brass 3/4-inch 1-inch 1-1/2 and 2-inch 2-1/2-inch Orifice, bronze 2-inch 2-1/2-inch Cap Screw, zinc plated steel 2-1/2-inch (6 req’d) Nameplate (not shown) Drive Screw (not shown)
1A5180 14012 1A3524 14012 1A5993 14012 1E4784 24092 1V3610 24092 1A9754 24092
15
1V3605 27022 1V3606 27142 1V3607 27142 1V3608 27142 1C3982 27042
16
1A9410 02112 1A9461 02112 1A9511 02112 1A9743 02112 1A9755 02112 1C1582 03022 1C1586 03022 1C1587 03022 1C1589 03022 1C1598 03022
17
19*
20 21 22
Part Number 1B7209 24052 1A3526 24052 1A3683 24052 1A3530 24052 1A5698 24052 1A5823 24052 1A3915 X0022 1A3527 24122 1A3465 24122 1A3537 24122 1A3412 24122 1A8991 X0012 0V0704 14012 1D5673 14012 J17796 X0012 0B0782 14012 001476 14012 1A9750 14012 0D0233 14012 1A9805 12012 1A9810 12012 1A3444 24052 11B611 2X012 1A6767 28992 3
R
Type 75A
While this information is presented in good faith and believed to be accurate, Fisher Controls does not guarantee satisfactory results from reliance upon such information. Nothing contained herein is to be construed as a warranty or guarantee, express or implied, regarding the performance, merchantability, fitness
R
4
Printed in U.S.A.
Fisher Controls
or any other matter with respect to the products, nor as a recommendation to use any product or process in conflict with any patent. Fisher Controls reserves the right, without notice, to alter or improve the designs or specifications of the products described herein.
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