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MWIA

Load holding valve from Sun Hydraulics.

Description

Vented, 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. Backpressure at port 2 does not affect the valve setting because the spring chamber references the vent (port 4).

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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.
  • 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.
  • This valve is functionally a 4-port counterbalance valve. It seats as a poppet valve and modulates as a spool valve, offering the best of both valve types.
  • All 4-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).
  • 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.
  • 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-24A
Series 4
Capacity 120 gpm
Capacity (metric) 480 L/min.
Maximum Operating Pressure 5000 psi
Maximum Operating Pressure (metric) 350 bar
Pilot Ratio 3:1
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 8.5
Reseat ≥77% of setting
Valve Hex Size 1 5/8 in.
Valve Hex Size (metric) 41,3 mm
Valve Installation Torque 350 – 375 lbf ft
Valve Installation Torque (metric) 474 – 508 Nm
Adjustment Screw Internal Hex Size 7/32 in.
Adjustment Screw Internal Hex Size (metric) 5,5 mm
Locknut Hex Size 3/4 in.
Locknut Hex Size (metric) 19,1 mm
Locknut Torque 25 – 30 lbf ft
Locknut Torque (metric) 35 – 40 Nm
Seal kit – Cartridge Viton: 990024006
Model Weight 4.16 lb.
Model Weight (metric) 1.89 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

N Buna-N
V Viton

Material/Coating

/AP Stainless Steel, Passivated
/LH Mild Steel, Zinc-Nickel
Cavity: T-24A
Nominal Capacity: 120 gpm (480 lpm )
Pilot Ratio: 3:1
Downloads
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Possible variants

MWIALHN, MWIA-LHN, MWIALHN/LH, MWIA-LHN/LH, MWIALHV, MWIA-LHV, MWIALHV/AP, MWIA-LHV/AP, MWIALHV/LH, MWIA-LHV/LH, MWIALJN, MWIA-LJN, MWIALJN/AP, MWIA-LJN/AP, MWIALJN/LH, MWIA-LJN/LH, MWIALJV, MWIA-LJV, MWIALJV/AP, MWIA-LJV/AP, MWIALJV/LH, MWIA-LJV/LH, MWIAXKN, MWIA-XKN, MWIAXKV, MWIA-XKV, MWIAXLV, MWIA-XLV, MWIAXMN, MWIA-XMN, MWIAXMV, MWIA-XMV

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