Instruction Manual
Form 511
September 2009
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 selfcontained, 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.
Type 75A
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.
www.emersonprocess.com/regulators
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).
D100254X012
Type 75A
8
9
10
11
2
7
6
12
14
4
1
17
13
16
5
3
Note
A piece of hex bar stock can be drilled
out and slipped over the disk holder shaft
to t inside the holder. This simplies
removal of the holder from the yoke.
Use the following sizes of hex bar:
NPS 1/2 (DN 15) body – 7/8-inch (22 mm) hex;
NPS 3/4 (DN 20) body – 1-inch (25 mm) hex;
NPS 1 or 1-1/2 (DN 25 or 40) body –
1-1/4-inch (32 mm) hex; NPS 2 (DN 50)
body – 2-inch (51 mm) hex; NPS 2-1/2 (DN 65)
body – 2-1/2-inch (63 mm) 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, rst 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
APPLY GASKALAC
20A5581-B
A0209
NPS 1/2, 3/4, 1, AND 1-1/2 BODY (DN 15, 20, 25, AND 40)
Figure 2. Type 75A Assemblies
When corresponding with your local Sales Ofce
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 Description Part Number
1 Body
Bronze
NPS 1/2 (DN 15) 2A940812012
NPS 3/4 (DN 20) 2D226312012
NPS 1 (DN 25) 2V361512012
NPS 1-1/2 (DN 40) 3D174012012
NPS 2 (DN 50) 3D626712012
NPS 2-1/2 (DN 65) 3E231012012
2 Spring Case
Cast Iron
NPS 1/2 (DN 15) 1D878619042
NPS 3/4 (DN 20) 00085719042
NPS 1 (DN 25) 2A480119042
NPS 1-1/2 (DN 40) 3V361319042
NPS 2 and 2-1/2 (DN 50 and 65) 00132019042
Key Description Part Number
3 Guide Plug
Bronze
NPS 1/2 (DN 15) 0W099412012
NPS 3/4 (DN 20) 1A971912012
NPS 1 (DN 25) 1A950812012
NPS 1-1/2 (DN 40) 1A974612012
NPS 2 (DN 50) 1A975212012
NPS 2-1/2 (DN 65) 0D023212012
4 Valve Yoke
Bronze
NPS 1/2 (DN 15) 1A942712012
NPS 3/4 (DN 20) 1A945512012
NPS 1 (DN 25) 1A951412012
NPS 1-1/2 (DN 40) 2V361412012
NPS 2 (DN 50) 2V361612012
NPS 2-1/2 (DN 65) 2V361712012
5 Valve Disk Holder
Bronze
NPS 1/2 (DN 15) 1B590112012
NPS 3/4 (DN 20) 1B590212012
NPS 1 (DN 25) 1B867312012
NPS 1-1/2 (DN 40) 1B867712012
NPS 2 (DN 50) 1B867912012
NPS 2-1/2 (DN 65) 1B869812012
6 Diaphragm Head
NPS 1/2 (DN 15), Steel 1A941524092
NPS 3/4 (DN 20), Cast Iron 1A945619042
NPS 1 (DN 25), Cast Iron 1A950919052
NPS 1-1/2 (DN 40), Cast Iron 1V361219042
NPS 2 and 2-1/2 (DN 50 and 65), Cast Iron 1A975819042
2
Type 75A
8
9
10
11
2
7
14
15
6
12
1
4
19
16
5
13
17
3
14
8
9
10
11
2
7
15
6
12
1
4
19
16
5
13
17
3
20
APPLY
GASKALAC
30A5582-A
A0211
NPS 2 (DN 50) BODY NPS 2-1/2 (DN 65) BODY
Figure 2. Type 75A Assemblies (continued)
Key Description Part Number
7 Diaphragm Nut
Steel
NPS 1/2 (DN 15) 1A941424092
NPS 3/4 (DN 20) 1E478524092
NPS 1 (DN 25) 1V361124092
NPS 1-1/2 (DN 40) 1A974824092
NPS 2 and 2-1/2 (DN 50 and 65) 1A982424092
8 Set Screw
Zinc-plated steel
NPS 1/2 (DN 15) 1C216032992
NPS 3/4 (DN 20) 1A514428992
NPS 1 and 1-1/2 (DN 25 and 40) 1F575328992
NPS 2 and 2-1/2 (DN 50 and 65) 1V360928982
9 Hex Nut
Brass
NPS 1/2 and 3/4 (DN 15 and 20) 1A518014012
NPS 1 and 1-1/2 (DN 25 and 40) 1A352414012
NPS 2 and 2-1/2 (DN 50 and 65) 1A599314012
10 Spring Seat
Steel
NPS 1/2 and 3/4 (DN 15 and 20) 1E478424092
NPS 1 (DN 25) 1V361024092
NPS 1-1/2 to 2-1/2 (DN 40 to 65) 1A975424092
11 Spring
Spring wire
NPS 1/2 (DN 15) 1V360527022
NPS 3/4 (DN 20) 1V360627142
NPS 1 (DN 25) 1V360727142
NPS 1-1/2 (DN 40) 1V360827142
NPS 2 and 2-1/2 (DN 50 and 65) 1C398227042
*Recommended spare part.
APPLY
GASKALAC
30A5580-A
A0212
Figure 2. Type 75A Assemblies (continued)
Key Description Part Number
12* Diaphragm
Neoprene (CR)
NPS 1/2 (DN 15) 1A941002112
NPS 3/4 (DN 20) 1A946102112
NPS 1 (DN 25) 1A951102112
NPS 1-1/2 (DN 40) 1A974302112
NPS 2 and 2-1/2 (DN 50 and 65) 1A975502112
13* Valve Disk
Nitrile (NBR)
NPS 1/2 (DN 15) 1C158203022
NPS 3/4 (DN 20) 1C158603022
NPS 1 (DN 25) 1C158703022
NPS 1-1/2 and 2 (DN 40 and 50) 1C158903022
NPS 2-1/2 (DN 65) 1C159803022
14 Cap Screw
Zinc-plated steel
NPS 1/2 (DN 15) (6 required) 1B720924052
NPS 3/4 (DN 20) (6 required) 1A352624052
NPS 1 (DN 25) (8 required) 1A368324052
NPS 1-1/2 (DN 40) (8 required) 1A353024052
NPS 2 (DN 50) (10 required) 1A569824052
NPS 2-1/2 (DN 65) (4 required) 1A582324052
15 Hex Nut
Zinc-plated steel
NPS 1/2 (DN 15) (6 required) 1A3915X0022
NPS 3/4 (DN 20) (6 required) 1A352724122
NPS 1 and 1-1/2 (DN 25 and 40) (8 required) 1A346524122
NPS 2 (DN 50) (10 required) 1A353724122
NPS 2-1/2 (DN 65) (6 required) 1A341224122
3
Type 75A
Key Description Part Number
16 Machine Screw
Brass
NPS 1/2 (DN 15) 1A8991X0012
NPS 3/4 and 1 (DN 20 and 25) 0V070414012
NPS 1-1/2 and 2 (DN 40 and 50) 1D567314012
NPS 2-1/2 (DN 65) J17796X0012
17 Disk Retainer Washer
Brass
NPS 3/4 (DN 20) 0B078214012
NPS 1 (DN 25) 00147614012
NPS 1-1/2 and 2 (DN 40 and 50) 1A975014012
NPS 2-1/2 (DN 65) 0D023314012
*Recommended spare part.
Key Description Part Number
19* Orice
Bronze
NPS 2 (DN 50) 1A980512012
NPS 2-1/2 (DN 65) 1A981012012
20 Cap Screw
Zinc-plated steel
NPS 2-1/2 (DN 65) (6 required) 1A344424052
21 Nameplate (not shown) 11B6112X012
22 Drive Screw (not shown) 1A676728992
Industrial Regulators
Emerson Process Management
Regulator Technologies, Inc.
USA - Headquarters
McKinney, Texas 75069-1872 USA
Tel: 1-800-558-5853
Outside U.S. 1-972-548-3574
Asia-Pacic
Shanghai, China 201206
Tel: +86 21 2892 9000
Europe
Bologna, Italy 40013
Tel: +39 051 4190611
Middle East and Africa
Dubai, United Arab Emirates
Natural Gas Technologies
Emerson Process Management
Regulator Technologies, Inc.
USA - Headquarters
McKinney, Texas 75069-1872 USA
Tel: 1-800-558-5853
Outside U.S. 1-972-548-3574
Asia-Pacic
Singapore, Singapore 128461
Tel: +65 6777 8211
Europe
Bologna, Italy 40013
Tel: +39 051 4190611
Gallardon, France 28320
Tel: +33 (0)2 37 33 47 00
TESCOM
Emerson Process Management
Tescom Corporation
USA - Headquarters
Elk River, Minnesota 55330-2445 USA
Tel: 1-763-241-3238
Europe
Selmsdorf, Germany 23923
Tel: +49 (0) 38823 31 0
Tel: +971 4811 8100
For further information visit www.emersonprocess.com/regulators
The Emerson logo is a trademark and service mark of Emerson Electric Co. All other marks are the property of their prospective owners. Fisher is a mark owned by Fisher Controls, Inc., a
business of Emerson Process Management.
The contents of this publication are presented for informational purposes only, and while every effort has been made to ensure their accuracy, they are not to be construed as warranties or
guarantees, express or implied, regarding the products or services described herein or their use or applicability. We reserve the right to modify or improve the designs or specications of such
products at any time without notice.
Emerson Process Management does not assume responsibility for the selection, use or maintenance of any product. Responsibility for proper selection, use and maintenance of any Emerson
Process Management product remains solely with the purchaser.
©Emerson Process Management Regulator Technologies, Inc., 1945, 2009; All Rights Reserved
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