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Quick Coupling Division
8145 Lewis Road • Minneapolis, MN 55427
www.parker.com/quickcouplings
E-15
E
Valves
Pressure/Vacuum Relief Valves
H1 and HM1 Series
H1 Series Pressure/Vacuum Relief Valves
are
used to maintain positive pressure in hydraulic reservoirs.
The compact size, reusable bronze filter and high flow
characteristics make this valve a popular choice.
The
HM1 Series
offers the same features and characteris-
tics as the H1 series with the option of manual over ride.
This feature allows the operator to relieve the reservoir
pressure before opening the tank for refilling,
inspection or servicing.
Features
1.
Easy to remove, cleanable bronze filter.
2.
High flow characteristics.
3.
Compact size.
4.
Available with male pipe or male ORB threads.
5.
Wide variety of pressure relief settings.
6.
HM1 series has a manual pressure relief button.
Specifications
Note: HM1 Series not shown
H1 Series
HM1 Series
Filter Rating
10 micron, nominal
Pressure Relief Setting
5 PSI through 50 PSI
(in 5 PSI increments)
Vacuum Relief Setting
0.3 PSI
Weight
1.0 lbs
1.1 lbs
FITTING STYLE:
MP
= Male pipe thread
MO
= Male O-ring Boss, SAE threads
FITTING SIZE:
6
= 3/8”
8
= 1/2”
12
= 3/4”
16
= 1”
SERIES:
H1
HM1
(with manual pressure relief button)
CRACK PRESSURE (PSI):
5
to
50
(in 5 PSI increments)
H
✱
-
✱ ✱
-
✱ ✱ ✱ ✱
Flow Data
H1 and HM1 Pressure-Vacuum Relief Valve
0
5
10
15
20
05
04
03
02
01
0
Flow in SCFM
Pressure drop is pressure relief valve crack pressure until
pressure drop curve increases above pressure relief crack pressure.
Pressure Drop in PSID
Vacuum
Relief
Pressure
Relief
*
*
Ordering Information
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