DIRECTIONAL VALVES
PC08-30 Check, Pilot-to-Open
DESCRIPTION
A screw-in, cartridge-style, pilot-operated, hydraulic check valve for use in blocking
or load-holding circuits.
OPERATION
The PC08-30 allows fl ow from ➁ to ➂, while normally blocking fl ow from ➂ to ➁.
Flow will be allowed from
➂ to ➁ when suffi cient pressure is applied at ➀.
The cartridge has a 3:1 pilot ratio, meaning that at least one-third of the load pressure
held at
➂ is required at ➀ to open the valve.
The check is spring-biased to assure holding in static or no-load conditions. A sealed
pilot piston option is available.
FEATURES
• Hardened seat for long life and low leakage.
• Optional sealed piston.
• Optional spring ranges.
• Compact size.
RATINGS
Operating Pressure: 240 bar (3500 psi)
Flow: See Performance Chart
Maximum Internal Leakage at 207 bar (3000 psi):
➂ to ➁: 0.25 ml/minute (5 drops/minute)
➁ to ➀ without sealed piston: 115 ml/minute (7 cu. in./minute)
➁ to ➀ with sealed piston: zero leakage
Pilot Ratio: 3:1
Check Spring Bias: 1.72 bar (25 psi) standard;
With sealed piston option: 6.2 bar (90 psi) minimum
Temperature: -40 to 120°C with standard Buna 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: VC08-3; See page 9.108.1
Cavity Tool: CT08-3XX; See page 8.600.1
Seal Kit: SK08-3X-TM; See page 8.650.1
USASI:
ISO:
PERFORMANCE (Cartridge Only)
SYMBOLS
4.100.1
8.6/125
6.9/100
5.2/75
3.4/50
1.7/25
7.5
2
15.1
4
22.7
6
FLOW lpm/gpm
PRESSURE DROP bar/psi
to — (p); to - - - (r)
32 cSt/150 ssu oil at 40°C
30.2
8
➂➁ ➁➂
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TO ORDER
PC08-30
DIMENSIONS
MATERIALS
4.100.2
Porting
Cartridge Only 0
SAE 6 6T
3/8 in. BSP* 3B
*BSP Body;
U.K. Mfr. Only
Seals
N Buna N (Std.)
NS Buna N with Sealed Piston:
6.2 bar (90 psi) minimum spring
V Fluorocarbon
VS Fluorocarbon with Sealed Piston:
6.2 bar (90 psi) minimum spring
Note: Other bias spring pressures available
for OEM applications. Consult factory.
PC08-30 __ - __ __ __ - __ - __ __ __
Options
None (Blank)
Bias Spring
(Blank) 1.72 bar/25 psi (Std.)*
70 4.8 bar/70 psi
90 6.2 bar/90 psi
120 8.2 bar/120 psi
270 18.3 bar/270 psi
* PC08-30 valves built with standard 25 psi
spring are not stamped with spring rating.
Other spring ratings are stamped on valve.
Cartridge: Weight: 0.08 kg. (0.18 lbs.)
Steel with hardened work surfaces.
Zinc-plated exposed surfaces.
Buna N O-rings and back-ups
standard.
Standard Ported Body: Weight:
0.27 kg. (0.60 lbs.) Anodized high-
strength 6061 T6 aluminum alloy,
rated to 207 bar (3000 psi). Ductile
iron bodies available; dimensions
may differ. See page 8.008.1
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