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MBGA

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.
  • Cartridges configured with EPDM seals are for use in systems with phosphate ester fluids. Exposure to petroleum based fluids, greases and lubricants will damage the seals.
  • 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 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 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

N Buna-N
V Viton
E EPDM

Material/Coating

/AP Stainless Steel, Passivated
/LH Mild Steel, Zinc-Nickel
Cavity: T-17A
Nominal Capacity: 60 gpm ( 240 lpm)
Pilot Ratio: 3:1
Downloads
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Possible variants

MBGALHE, MBGA-LHE, MBGALHN, MBGA-LHN, MBGALHN/LH, MBGA-LHN/LH, MBGALHV/AP, MBGA-LHV/AP, MBGALHV/LH, MBGA-LHV/LH, MBGALJN, MBGA-LJN, MBGALJN/AP, MBGA-LJN/AP, MBGALJN/LH, MBGA-LJN/LH, MBGALJV, MBGA-LJV, MBGALJV/AP, MBGA-LJV/AP, MBGALJV/LH, MBGA-LJV/LH, MBGAXKE, MBGA-XKE, MBGAXKN, MBGA-XKN, MBGAXKN/LH, MBGA-XKN/LH, MBGAXKV, MBGA-XKV, MBGAXKV/LH, MBGA-XKV/LH, MBGAXLE, MBGA-XLE, MBGAXLN/LH, MBGA-XLN/LH, MBGAXLV, MBGA-XLV, MBGAXLV/LH, MBGA-XLV/LH, MBGAXME, MBGA-XME, MBGAXMN, MBGA-XMN, MBGAXMN/LH, MBGA-XMN/LH, MBGAXMV, MBGA-XMV, MBGAXMV/LH, MBGA-XMV/LH

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