Load holding valve from Sun Hydraulics.
Description
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.
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- 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
Note: Data may vary by configuration. See CONFIGURATION section.
| Cavity |
T-17A |
| Series |
3 |
| Capacity |
60 gpm |
| Capacity (metric) |
240 L/min. |
| Maximum Operating Pressure |
5000 psi |
| Maximum Operating Pressure (metric) |
350 bar |
| Pilot Ratio |
1.5:1 |
| Maximum Recommended Load Pressure |
See Technical Features |
| Factory Pressure Settings Established at |
2 in³/min. |
| Factory Pressure Settings Established at (metric) |
30 cc/min. |
| Maximum Valve Leakage at Reseat |
5 drops/min. |
| Maximum Valve Leakage at Reseat (metric) |
0,3 cc/min. |
| Check Cracking Pressure |
25 psi |
| Check Cracking Pressure (metric) |
1,7 bar |
| Adjustment – No. of CCW Turns from Min. to Max. Setting |
9 |
| Reseat |
≥77% of setting |
| Valve Hex Size |
1 1/4 in. |
| Valve Hex Size (metric) |
31,8 mm |
| Valve Installation Torque |
150 – 160 lbf ft |
| Valve Installation Torque (metric) |
203 – 217 Nm |
| Adjustment Screw Internal Hex Size |
5/32 in. |
| Adjustment Screw Internal Hex Size (metric) |
4 mm |
| Locknut Hex Size |
9/16 in. |
| Locknut Hex Size (metric) |
15 mm |
| Locknut Torque |
80 – 90 lbf in. |
| Locknut Torque (metric) |
9 – 10 Nm |
| Seal kit – Cartridge |
Viton: 990017006 |
| Model Weight |
2.09 lb. |
| Model Weight (metric) |
0.95 kg. |
Configuration Options
Control
| L |
Standard Screw Adjustment |
Functional Setting Range
| H |
1000 – 4000 psi (70 – 280 bar), 3000 psi (210 bar) Standard Setting |
| J |
2000 – 5000 psi (140 – 350 bar), 3000 psi (210 bar) Standard Setting |
Seal Material
Material/Coating
| /AP |
Stainless Steel, Passivated |
