Created on 07/12/2015
c
2015 Sun Hydraulics Corporation See www.sunhydraulics.com for detailed product information 1 of 2
MODEL
MBGA
3:1 pilot ratio, load reactive load control valve
SERIES 3 / CAPACITY: 240 L/min. / CAVITY: T-17A
3-Port Non-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.
TECHNICAL DATA
Pilot Ratio 3:1
Maximum Recommended Load Pressure at Maximum Setting 260 bar
Maximum Setting 350 bar
Factory Pressure Settings Established at 30 cc/min.
Maximum Valve Leakage at Reseat 0,3 cc/min.
Check Cracking Pressure 1,7 bar
Adjustment - Number of Counterclockwise Turns to Increase Setting 9
Reseat >85% of setting
Locknut Hex Size 15 mm
Locknut Torque 9 - 10 Nm
Seal kit - Cartridge Buna: 990-017-007
Seal kit - Cartridge Polyurethane: 990-017-002
Seal kit - Cartridge Viton: 990-017-006
(L)CONTROL
L Standard Screw Adjustment
(H)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
(N)SEAL MATERIAL
N Buna-N
V Viton
MATERIAL/COATING
Standard Material/Coating
/AP Stainless Steel, Passivated
snhy.com/
MBGA
TECHNICAL FEATURES
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).
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 worlds.
Model Code Example: MBGALHNCONFIGURATION OPTIONS
Created on 07/12/2015
c
2015 Sun Hydraulics Corporation See www.sunhydraulics.com for detailed product information 2 of 2
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.
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.
PERFORMANCE CURVES
RELATED MODELS
MBGAX Fixed setting, 3:1 pilot ratio, load reactive load control valve
