Page 121 - ParkerBrassCatalog2010

Parker Hannifn Corporation
Parker Brass Products Division
Otsego, Michigan
C17
C
Blocking Valves
Principle
Prestobloc pilot-operated blocking fttings are designed for mounting
directly to the cylinder ports. Available with push-in or threaded
terminations, these function fttings permit safe and immediate stopping
of the piston rod by blocking the cylinder supply and exhaust.
Operation
• Pilot operated diaphragm maintains full fow when pilot signal is
present.
• Spring closes the poppet valve locking air in the cylinder when the
pilot signal is removed.
• Prestobloc fttings used in conjunction with Prestofow fow
regulators are mounted on inlet and outlet ports.
• Pilot signal should be independent from the control valve.
Advantages
• Compact
• Direct mounting
• Safety
• Independent control
Valve Specifcations
MaximumWorking Pressure: 145 PSI
Operating Temperature: +5°- +150° F
Body Material: Zinc alloy epoxy coated
Bolt Material: Brass
Blocking principle
With control signal
Without control signal
P
Moving Blocked
exhaust
supply
Pilot signal
P
exhaust
supply
Removal
initiates blocking
Control signal
Diaphragm
Poppet valve
Spring
To power valve
Cylinder
Control signal
Diaphragm
Poppet valve
Spring
To power valve
Cylinder