Emerson 75A Data Sheet
Type 75A Water Pressure Regulator
Bulletin 71.1:75A
August 2009
W2248
EXTERIOR
Figure 1. Type 75A Regulator
Introduction
The Type 75A regulator is designed to reduce
domestic or industrial water pressure, thus protecting
plumbing xtures and meters from high-pressure
surges. The Type 75A is self-contained, requiring no
external control line for operation.
Downstream pressure is directly registered under
the diaphragm. As the downstream pressure
increases, the diaphragm force overcomes the spring
W0057
SECTIONAL VIEW
FOR NPS 1/2, 3/4, 1, AND 1-1/2
(DN 15, 20, 25, AND 40) BODIES
compression, causes the valve disk to rise, and
reduces ow through the regulator.
If the downstream pressure decreases, the spring force
pushes the valve yoke and disk down to open the body
port. This permits increased ow and increases outlet
pressure to the desired level. The spring for each
regulator allows operation over an outlet pressure range
of 20 to 80 psig (1,4 to 5,5 bar). The outlet pressure
setting is easily changed by turning the adjusting screw.
D100116X012
www.emersonprocess.com/regulators
Bulletin 71.1:75A
Specications
Body Size
NPS 1/2, 3/4, 1, and 1-1/2 (DN 15, 20, 25, and 40)
with integral cast seats
NPS 2 and 2-1/2 (DN 50 and 65) with
threaded-in seats
Maximum Inlet Pressure
(1)
200 psig (13,8 bar)
Outlet Pressure Ranges
20 to 80 psig (1,4 to 5,5 bar)
Maximum Allowable Outlet Pressure
(1)
10% above spring setting, or 5 psig (0,34 bar)
Minimum Operating Differential
5 psi (0,34 bar)
Maximum Operating Temperature
-20° to 150°F (-29° to 66°C)
Construction Materials
Body: Bronze
Spring Case: Cast iron
Threaded-in Orice (NPS 2 and 2-1/2
(DN 50 and 65) units only): Bronze
Valve Disk and Holder: Nitrile (NBR) and bronze
Diaphragm: Nitrile (NBR)
(1)
(1)
above setting, whichever is greater
1. The pressure/temperature limits in this bulletin or any applicable standard limitation should not be exceeded.
Table 1. Capacity Chart for Type 75A Regulator
CAPACITIES IN GPM (l/min) OF WATER
BODY SIZE, NPS (DN)
5 (0,34) 7 (0,48)
1/2 (15)
3/4 (20)
1 (25)
1-1/2 (40)
2 (50)
2-1/2 (65)
1. The 7 psig (0,48 bar) offset pressure and the related capacities are considered the upper limits of ows consistent with good piping practices and maximum uid velocities of
10 feet per second (3,05 m/s).
8 (30,3)
16 (60,6)
25 (94,6)
50 (189)
75 (284)
115 (435)
10 (37,9)
20 (75,7)
33 (125)
65 (246)
95 (360)
140 (530)
Droop, PSIG (bar)
(1)
10 (0,69) 15 (1,0)
14 (53,0)
28 (106)
45 (170)
85 (322)
125 (473)
185 (700)
19 (71,9)
40 (151)
60 (227)
115 (435)
175 (662)
260 (984)
WIDE-OPEN CV FOR
RELIEF SIZING
4.3
8.4
13.5
28.0
39.0
64.0
2
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