PRESSURE CONTROLS
PRES50-30 Pressure Reducing/Relieving
USASI/ISO:
SYMBOLS
PERFORMANCE
(Cartridge Only)
6.404.1
DESCRIPTION
A screw-in, cartridge-style, direct-acting, spool-type reducing/relieving valve designed
to act as a pressure regulating device for secondary circuits. It is intended for use in
stable-input fl ow circuits.
OPERATION
In its steady state, the PRES50-30 allows bidirectional fl ow from ➂ to ➁ with the
spring chamber constantly drained at
➀. Upon attainment of a predetermined
pressure at
➁, the valve will shift to block fl ow at ➂, thereby regulating pressure at ➁.
In this mode, the valve will also relieve port
➁ to port ➀ at a variable value over the
set reducing pressure.
The tank port pressure is additive to the pressure setting at a ratio of 1:1.
FEATURES
• High Pressure steel adapter on inlet port ➂ withstands up to 345 bar (5000 psi).
• Hardened spool and cage for long life.
RATINGS
Maximum Rated Pressure at Supply Port: 345 bar (5000 psi)
Regulated Pressure Range: 31 to 55.2 bar (450 to 800 psi) at no-fl ow
Maximum Tank Port Pressure: 68.9 bar (1000 psi)
Rated Flow: 11.4 lpm (3 gpm) maximum
Maximum Internal Leakage: 131 ml/minute (8 cu. in./minute)
Temperature: -40 to 100°C with Buna N seals
-26°C to 204°C with Fluorocarbon seals
-54°C to 107°C with Polyurethane seals
Filtration: See page 9.010.1
Fluids: Mineral-based or synthetics with lubricating properties at viscosities of
7.4 to 420 cSt (50 to 2000 sus); See Temperature and Oil Viscosity, page 9.060.1
Installation: No restrictions; See page 9.020.1
Cavity: VC98-3; See page 9.110.1
Cavity Tool: CT98-3XX; See page 8.600.1
Seal Kit: SK10-2X-0_SPL; See page 8.650.1
HYDRAFORCE
.com
®
3
2
1
2.8/40
2.1/30
4.8/70
3.4/50
4.1/60
1.4/20
0.7/10
7.8
2.0
5.7
1.5
9.5
2.5
3.8
1.0
1.9
0.5
11.4
3.0
FLOW lpm/gpm
PRESSURE bar/psi
Pressure Drop vs. Flow; 3 to 2
32 cSt/150 sus oil at 40°C
Reducing/Relieving Pressure vs. Flow
PRESSURE bar/psi
PRESSURE bar/psi
41.4/600
13.8/200
27.6/400
55.2/800
68.9/1000
82.7/1200
41.4/600
13.8/200
27.6/400
55.2/800
68.9/1000
82.7/1200
FLOW lpm/gpm
9.5
2.5
11.4
3.0
7.8
2.0
5.7
1.5
3.8
1.0
1.9
0.5
0 1.9
0.5
3.8
1.0
5.7
1.5
7.8
2.0
9.5
2.5
11.4
3.0
Reducing Pressure 3 to 2Relieving Pressure 2 to 1
Blue rectangles are links to other catalog pages.
DIMENSIONS
MATERIALS
Cartridge: Weight: 0.22 kg. (0.49 lbs.);
Steel with hardened work surfaces.
Zinc-plated exposed surfaces.
O-rings standard.
Standard Ported Body: Weight:
0.34 kg. (0.75 lbs.) Anodized high-
strength 6061 T6 aluminum alloy,
rated to 207 bar (3000 psi). Ductile
iron bodies available; dimensions
may differ. See page 8.010.1.
TO ORDER
PRES50-30
- __ __ __ - __ - 08 / 04.5
Spring Range
08 31.0 to 55.2 bar
(450 to 800 psi)
Seals
Buna N N
Fluourocarbon V
Polyurethane P
PRES50-30
6.404.2
Pressure Setting
04.5 31.0 bar (450 psi)
®
HYDRAFORCE
HYDRAFORCE
.com
®
1.25
31.8
1.25
31.8
2.50
63.5
1.11
28.2
Dia.
1.41
35.8
2.84
72.1
3.25
82.6
2.00
50.8
0.28
7.1
2.02
51.3
4
2
0.78
19.8
0.25
6.4
INCH
MILLIMETRE
3
1.38
35.0
SAE 06
2.58
65.5
3
2
1
1.00
25.4
ACROSS FLATS
Note: Either body port 2 or body port 3 can be blocked.
TORQUE
50 – 55 ft-lbs
(67.8 – 74.6 Nm)
SAE 06
3
Porting
Cartridge Only 0
SAE 6 6T
SAE 8 8T
Polyurethane seals are required for
operation over 241 bar/3500 psi.
Blue rectangles are links to other catalog pages.