1.5:1 pilot ratio, load reactive, load control valve

Cavity: T-17A | Capacity:

Model

MBGBLHN

Control

Functional Setting Range

Seal Material

Material/Coating

Where to buy

Technical features

Load reactive, load control valves with pilot assist combine two valves; a check valve and a relief valve. The check valve allows free flow from the directional valve (port 2) to the load (port 1) while a direct-acting, pilot-assisted relief valve controls flow from port 1 to port 2. Pilot assist at port 3 lowers the effective setting of the relief valve at a rate determined by the pilot ratio.

Set at least 1.3 times the maximum load induced pressure (1.5 times when the setting is less than 2000 psi or 140 bar).
The maximum recommended load pressure for the H range is 3080 psi (212 bar).
The maximum recommended load pressure for the J range is 3850 psi (265 bar).
Turn adjustment clockwise to decrease setting and release load.
Full clockwise setting is 1000 psi (70 bar) for the H range and 2000 psi (140 bar) for the J range.
Backpressure at port 2 adds to the effective relief setting at a ratio of 1 plus the pilot ratio times the backpressure.
This valve is functionally a 3-port counterbalance valve. It seats as a poppet valve and modulates as a spool valve, offering the best of both valve types.
These valves are capable of modulating over a broader range of flows than the pure poppet designs. The longer stroke allows us to incorporate a uni-directional damping device that smooths the opening and lets the valve close quickly.
Corrosion resistant cartridge valves are intended for use in corrosive environments and are identified by the model code suffix /AP for external stainless steel components, or /LH for external zinc-nickel plated components. See the CONFIGURATION section for all options. For further details, please see the Materials of Construction page located under TECH RESOURCES.
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.
This valve has full relief capacity.
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.

Technical Data

Cavity
T-17A
Series
3
Capacity
60 gpm
Maximum Operating Pressure
5000 psi
Pilot Ratio
1.5:1
Maximum Recommended Load Pressure
See Technical Features
Adjustment - No. of CCW Turns from Min. to Max. Setting
9
Check Cracking Pressure
25 psi
Factory Pressure Settings Established at
2 in³/min.
Maximum Valve Leakage at Reseat
5 drops/min.
Reseat
≥77% of setting
Valve Hex Size
1 1/4 in.
Valve Installation Torque
150 - 160 lbf ft
Adjustment Screw Internal Hex Size
5/32 in.
Locknut Hex Size
9/16 in.
Locknut Torque
80 - 90 lbf in.
Seal kit - Cartridge
Buna: 990-017-007
Seal kit - Cartridge
Polyurethane: 990-017-002
Seal kit - Cartridge
Viton: 990-017-006

Performance curves

CAD Files

Model CAD Files

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Symbol CAD Files

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.dwg

.dxf

Frequently asked questions

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?