SUMMARY:  Cartridge

Quantity in stock: 2

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  • Hydrotech Stock: 0 ships immediately
  • Factory Stock: 2 ships July 2, 2021
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This 2-port, pilot-stage, direct-acting relief cartridge is an electro-proportionally controlled, normally-closed pressure regulating valve. The valve is spring biased closed to its highest setting (customer specified). Increasing current to the coil will proportionally decrease the pressure setting. When the pressure at port 1 (inlet) is sufficient to overcome the spring force minus the solenoid force, as determined by the analog input signal, the poppet lifts and allows flow from port 1 to port 2 (outlet). This pilot control cartridge utilizes the T-8A cavity so it can be used in conjunction with Sun's main stage, pressure control elements.

  • Customer must specify a relief setting that falls within the selected pressure range. This setting represents the maximum relief pressure which the valve will default to with no command. As the command increases, the relief setting will decrease. See performance curves for selected pressure range. This setting is not adjustable in the field.
  • Varying the analog input signal to the proportional solenoid provides a step-less control of pressure.
  • This electro-proportional cartridge utilizes the Sun T-8A, 2-port cavity making it the ideal choice to use in conjunction with Sun's main stage cartridges. Separate pilot lines are eliminated and only one cavity needs to be machined to accommodate both the control and primary function. Note: All 2-port pilot stage control cartridges utilize the same cavity and are physically interchangeable. Functionality is the only consideration.
  • High pilot capacity allows for operation of larger size main stage elements.
  • Damped construction provides stable operation over a wide range of operating conditions.
  • Low leakage levels in the closed position. (Reseat occurs at 85% of cracking pressure.)
  • Coils are interchangeable with Sun's other full flow, solenoid operated valves and can be mounted on the tube in either direction.
  • For optimum performance, an amplifier with current sensing and adjustable dither should be used. Dither should be adjustable between 100 - 250 Hz.
  • Note: The main stage valve should first be installed to the correct torque value followed by the T-8A pilot control section into the main stage valve to its required torque value.
  • Incorporates the Sun floating style construction to minimize the possibility of internal parts binding due to excessive installation torque and/or cavity/cartridge machining variations.

Capacity.25 gpm1 L/min.
Maximum Operating Pressure5000 psi350 bar
Maximum Valve Leakage at Reseat1.5 in³/min.25 cc/min.
Reseat>85% of setting>85% of setting
Solenoid Tube Diameter.75 in.19 mm
Valve Hex Size7/8 in.22,2 mm
Valve Installation Torque20 - 25 lbf ft27 - 33 Nm
Model Weight (with coil)1.00 lb0,45 kg
Seal kit - CartridgeViton: 990-208-006
Seal and nut kit - CoilViton: 990-770-006Viton: 990-770-006

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