HYDAC Proportional Valves

HYDAC offers a wide range of Electrically Operated Proportional Pressure Relief Valves and Pressure Reducing/Relieving Valves. These proportional valves vary the output pressure in response to a variable electric input.

HYDAC electrically controlled, pilot operated proportional pressure relief valves are available with pressure ranges up to 5000 psi (350 bar). Models are available for flow rates up to 79 gpm (300 lpm).

HYDAC electrically controlled, direct acting and pilot operated proportional pressure reducing/relieving valves are available with pressure ranges from 200 psi (14 bar) up to 5000 psi (350 bar). Models are available for flow rates up to 16 gpm (60 lpm). Pressure control valves can be used to regulate the pressure applied to hydraulic actuators.

Electric current controls with PWM are recommended to be used for HYDAC Proportional Valves.

Features

• Wet armature construction
• Hardened operating parts to ensure minimal wear and extend service life
• One piece cartridge body design to maximize reliability
• Screen on pilot orifice to enhance safety
• Excellent stability throughout flow range
• Proportional water/weather resistant coils rated up to IP69K
• Continuous duty rated coils
• Optional coil voltages and molded-in connectors
• Air bleed screws
• All exposed cartridge surfaces zinc-plated to resist corrosion
• Industry common cavity
• Compact size
• Wide voltage range
• Cartridges are voltage interchangeable
• Low pressure drop

Pressure Relief, Pilot Operated, Spool Type
16 gpm (60 l/min) • 5000 psi (350 bar)

Description
A screw-in cartridge, pilot operated, spool type, pressure relief valve, intended for use as a pressure limiting device. This valve can be infinitely adjusted across a specified range using a variable electric input. Pressure output is proportional to DC current input.

Operation
The PDB08P-01 blocks flow from port 1 to port 2 until sufficient pressure is reached at port 1 to open the pilot stage by offsetting the electrically induced solenoid force. The pilot stage opens and allows flow from the back of the main piston to port 2. The resulting pressure imbalance causes the main spool to move against the return spring and allows flow from port 1 to port 2.

Electrical current increase will increase the relief pressure setting. With no current applied to the solenoid, the valve will relieve at approximately 75 psi.

Features

• Excellent stability throughout flow range
• 12 and 24 volt proportional waterproof coils
• Screen on pilot orifice to enhance safety
• Manual override option

Pressure Relief, Pilot Operated, Spool Type
31 gpm (120 l/min) • 5000 psi (350 bar)

Description
A screw-in cartridge, pilot operated, spool type, pressure relief valve, intended for use as a pressure limiting device. This valve can be infinitely adjusted across a specified range using a variable electric input. Pressure output is proportional to DC current input.

Operation
The PDB10P-01 blocks flow from port 1 to port 2 until sufficient pressure is reached at port 1 to open the pilot stage by offsetting the electrically induced solenoid force. The pilot stage opens and allows flow from the back of the main piston to port 2. The resulting pressure imbalance causes the main spool to move against the return spring and allows flow from port 1 to port 2.

Electrical current increase will increase the relief pressure setting. With no current applied to the solenoid, the valve will relieve at approximately 75 psi.

Features

• Excellent stability throughout flow range
• 12 and 24 volt proportional waterproof coils
• Screen on pilot orifice to enhance safety
• Manual override option

Pressure Relief, Pilot Operated, Spool Type
53 gpm (200 l/min) • 5000 psi (350 bar)

Description
A screw-in cartridge, pilot operated, spool type, pressure relief valve, intended for use as a pressure limiting device. This valve can be infinitely adjusted across a specified range using a variable electric input. Pressure output is proportional to DC current input.

Operation
The PDB12P-01 blocks flow from port 1 to port 2 until sufficient pressure is reached at port 1 to open the pilot stage by offsetting the electrically induced solenoid force. The pilot stage opens and allows flow from the back of the main piston to port 2. The resulting pressure imbalance causes the main spool to move against the return spring and allows flow from port 1 to port 2.

Electrical current increase will increase the relief pressure setting. With no current applied to the solenoid, the valve will relieve at approximately 25 psi.

Features

• Excellent stability throughout flow range
• 12 and 24 volt proportional waterproof coils
• Screen on pilot orifice to enhance safety
• Manual override option

Pressure Relief, Pilot Operated, Spool Type
79 gpm (300 l/min) • 5000 psi (350 bar)

Description
A screw-in cartridge, pilot operated, spool type, pressure relief valve, intended for use as a pressure limiting device. This valve can be infinitely adjusted across a specified range using a variable electric input. Pressure output is proportional to DC current input.

Operation
The PDB16P-01 blocks flow from port 1 to port 2 until sufficient pressure is reached at port 1 to open the pilot stage by offsetting the electrically induced solenoid force. The pilot stage opens and allows flow from the back of the main piston to port 2. The resulting pressure imbalance causes the main spool to move against the return spring and allows flow from port 1 to port 2.

Electrical current increase will increase the relief pressure setting. With no current applied to the solenoid, the valve will relieve at approximately 90 psi.

Features

• Excellent stability throughout flow range
• 12 and 24 volt proportional waterproof coils
• Screen on pilot orifice to enhance safety
• Manual override option

Pressure Reducing/Relieving Direct Acting, Spool Type
3 gpm (12 l/min) • 5000 psi (350 bar)

Description
A screw-in cartridge, direct acting, spool type, pressure reducing/relieving valve, intended for use as a pressure control device, which can proportionally control the reduced pressure across the specified range using variable electrical input signal. Reduced pressure output is proportional to DC current input. This valve maintains a constant reduced pressure regardless of pressure variations in the primary system. In addition to the reducing function, this valve also provides a relief function from the reduced pressure port to the tank port if pressure in the secondary circuit exceeds the set pressure.

Operation
When de-energized the PDR08-01 allows flow from port 1 (reduced pressure port) to port 3 (tank). Port 2 (inlet) is blocked. When current signal is applied, the solenoid armature moves the control spool and sets the control (reduced) pressure at port 1. Increasing the current applied will increase the reduced pressure proportionally. Port 3 is vented to tank. Back pressure on port 3 is directly additive to the pressure setting.

Pressure Reducing/Relieving Pilot Operated, Spool Type
16 gpm (60 l/min) • 5000 psi (350 bar)

Description
A screw-in cartridge, pilot operated, spool type, pressure reducing/relieving valve, intended for use as a pressure control device, which can proportionally control the reduced pressure across the specified range using a variable electrical input signal. Reduced pressure output is proportional to DC current input. This valve maintains a constant reduced pressure regardless of pressure variations in the primary system. In addition to the reducing function, this valve also provides a relief function from the reduced pressure port to the tank port, if pressure in the secondary circuit exceeds the set pressure.

Operation
The PDR08P-01 allows flow from port 2 to port 1 until sufficient pressure is reached at port 1 to open the pilot section by offsetting the electrically induced solenoid force. Increasing electrical current will increase the control (reduced) pressure at port 1. Any pressure on port 3 is additive to the pressure setting. With no current applied to the solenoid, the valve will maintain pressure at approximately 75 psi, regardless of the pressure at port 2.

Features

• Screen on pilot orifice to enhance safety
• 12 and 24 volt proportional waterproof coils
• Manual override option

Pressure Reducing/Relieving Pilot Operated, Spool Type
21 gpm (80 l/min) • 5000 psi (350 bar)

Description
A screw-in cartridge, pilot operated, spool type, pressure reducing/relieving valve, intended for use as a pressure control device, which can proportionally control the reduced pressure across the specified range using a variable electrical input signal. Reduced pressure output is proportional to DC current input. This valve maintains a constant reduced pressure regardless of pressure variations in the primary system. In addition to the reducing function, this valve also provides a relief function from the reduced pressure port to the tank port, if pressure in the secondary circuit exceeds the set pressure.

Operation
The PDR10P-01 allows flow from port 2 to port 1 until sufficient pressure is reached at port 1 to open the pilot section by offsetting the electrically induced solenoid force. Increasing electrical current will increase the control (reduced) pressure at port 1. Any pressure on port 3 is additive to the pressure setting. With no current applied to the solenoid, the valve will maintain pressure at approximately 75 psi, regardless of the pressure at port 2.

Features

• Screen on pilot orifice to enhance safety
• 12 and 24 volt proportional waterproof coils
• Manual override option