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Balanced, load control valve
Cavity: T-17A | Capacity:
See CAD Files tab below to request images.
Technical specifications
Balanced load control valves combine a balanced modulating element with a reverse flow check. The check valve allows free flow from the directional valve (port 2) to the load (port 1) while the pilot to open modulating element controls flow from port 1 to port 2. Pilot pressure at port 3 determines the flow setting.
- This valve has no relief function. Not even thermal expansion relief.
- Maximum valve leakage at reseat for I, K, M ranges is 5 drops/min. (0,3 cc/min.) at 200 psi (14 bar) below cracking pressure; E and G ranges is 3 cubic in/min. (50 cc/min.) at 50 psi (3,5 bar) below cracking pressure.
- E and G ranges are not meant for zero leak type applications.
- This valve is balanced against load pressures and therefore exhibits self-compensation. Flow is controlled by the pilot pressure. Because of dynamic seals, performance is best in the meter out mode with port 1 being the load and port 2 being tank.
- Backpressure at port 2 directly opposes pilot pressure at port 3.
- This valve is a physical replacement for a counterbalance valve but probably won't work well in a cross-piloted cylinder application. A low pilot ratio is needed for machine stability and a balanced load control has an infinitely high pilot ratio.
- Applications that use a separate pressure source to the pilot have been successful in providing smooth and stable load control.
- All 3-port counterbalance, load control, and pilot-to-open check cartridges are physically interchangeable (i.e. same flow path, same cavity for a given frame size).
- Sun load control and counterbalance cartridges can be installed directly into a cavity machined in an actuator housing for added protection and improved stiffness in the circuit.
- This valve has positive seals between all ports.
- 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.
- Cavity
- Series
- Capacity60 gpm
- Maximum Operating Pressure5000 psi
- Check Cracking Pressure25 psi
- Maximum Valve Leakage at ReseatSee Technical Features
- Valve Hex Size1 1/4 in.
- Valve Installation Torque150 - 160 lbf ft
- Seal kit - Cartridge
- Seal kit - Cartridge
- Seal kit - Cartridge
Why is turning the adjust screw for counterbalance valves opposite of most other valves?
What parts of the Sun cartridge valve are field serviceable?
You say your valves leak 5 drops/min. How can I keep my load from drifting?
How do I determine the setting of a counterbalance valve?
How do I know how much pilot pressure is required to lower a load with a counterbalance valve?
When should I use a vented counterbalance valve?
How does Sun test a counterbalance valve for leakage?
How do I decide which pilot ratio to select?
How big is a drop of hydraulic oil?
Why can't I use a counterbalance valve in a closed loop transmission circuit?
What do you mean by the setting of a counterbalance valve and what should it be?
I don't need pilot assist. Can I just block port 3?
Can I use an atmospherically vented counterbalance valve instead of the four-port version to save on plumbing?
Why is it that your valves have pilot ratios below 10:1, while other manufacturers start at 7:1 and go up?
Why can't I block the pilot vent port? That area is positively sealed, isn't it?
Should I replace the counterbalance valve if my cylinder is drifting or moving?
I have a pilot-to-open check on a large cylinder and the decompression is violent. Can I use a counterbalance instead?
How do I size a counterbalance valve?
Can I adjust a counterbalance valve in the field?
Why do you offer 2 check valve cracking pressures?
What happens to the counterbalance valve if I have backpressure in my system?
What do you mean by hysteresis when referring to a counterbalance valve?
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