Specifications
G28
Parker Hannifin Corporation
Pneumatic Division
Richland, Michigan
www.parker.com/pneumatics
Flow
Controls
Integrated
Fittings
Sensing Control
Panel
G
Sensing
Blocking Valves
Catalog 0600P-E
Blocking Valves - Features
Blocking Valves
The blocking valve is a single acting spring return
2/2 valve in a fitting format. The device requires a
pneumatic pilot signal to open, which allows free flow
of air or neutral gas. As long as a pilot signal is present,
the device will remain open. When the pilot signal is
removed, the internal spring will close the blocking
valve, bubble tight.
These devices have two primary design uses: (1) to
prevent unwanted gravity induced motion in cylinders
during shut down procedures or during periods of
lost supply pressure and (2) freezing the cylinder
position by using a blocking valve at each end of the
cylinder. Application needs such as tool or work piece
protection, horizontal indexing or inspection stops are
often satisfied by these devices.
To Power Valve
Control
Signal
2/2
Blocking
Valve
A +
A -
Blocking
Valve
Blocking
Valve
Control
To Power Valve
To C
y
linder
Piloting and De-Piloting PressurePWBA General Characteristics
Blocking Valve
Sizes
Pilot
with Operating Pressure of:
30 PSI 60 PSI 90 PSI 120 PSI
1/8" BSP or NPT 33 PSI 40 PSI 45 PSI 50 PSI
1/4" BSP or NPT 33 PSI 40 PSI 45 PSI 50 PSI
3/8" BSP or NPT 35 PSI 40 PSI 45 PSI 50 PSI
1/2" BSP or NPT 45 PSI 50 PSI 55 PSI 60 PSI
Blocking Valve
Sizes
Depilot
with Operating Pressure of:
30 PSI 60 PSI 90 PSI 120 PSI
1/8" BSP or NPT 20 PSI 25 PSI 30 PSI 34 PSI
1/4" BSP or NPT 20 PSI 25 PSI 30 PSI 34 PSI
3/8" BSP or NPT 20 PSI 25 PSI 30 PSI 34 PSI
1/2" BSP or NPT 25 PSI 30 PSI 34 PSI 40 PSI
Operating Pressure
0 to 150 PSI
Permissible Fluids
Air or neutral gas, 50 µm filtration,
lubricated or not
Operating Temperature
5° to 140°F (-15° to 60°C)
Storage Temperature
-40° to 160°F (-40° to 70°C)
Flow
See page w15
Mechanical Life
10 Million
Maximum Operating
Frequency
10Hz
Material:
Body
Zinc alloy
Mounting Screw
Brass
Maximum Mounting
Torque:
10-32 UNF and M5
88 inch pounds
1/8"
70 inch pounds
1/4"
105 inch pounds
3/8"
265 inch pounds
1/2"
310 inch pounds
Adjustment
N/A
Adjustment Locking
N/A
(Revised 12-3-12)