Vickers | SM4-4038-144-DCLTB-10-S7
SM4-40(38)-144-DCLTB-10-S7
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The SM4-40(38)-144-DCLTB-10-S7 servo valve is manufactured by Vickers and belongs to the Servo Valves series. It meters hydraulic flow in closed-loop automation systems, translating electrical current to spool position for precise actuator control. A maximum supply pressure rating of 210 bar (3000 psi) defines the upper limit of system pressure for continuous operation, while the valve remains functional down to a minimum supply pressure of 14 bar (200 psi). Its supply port proof pressure withstands 150 % of the maximum supply rating, and the return port proof pressure equals the maximum supply pressure, safeguarding the housing against blocked return lines. When the return port is open, burst pressure capacity reaches 250 % of the maximum supply pressure for additional safety. Electrical command signals enter through an MS-3106-14S-2S four-pin connector that aligns with standard military-style cabling. A mounting port circle diameter of 44.46 mm (1.75 in) fits common manifold interfaces, and the assembly weighs 2.8 kg (6.2 lb) in dry condition.
A 35 µm absolute integral pilot filter protects internal orifices from contamination, limiting maintenance in dirty oil environments. Hysteresis around null is held to 3 % of rated current, and linearity error remains below 10 % of rated current to support predictable flow response. Symmetry error is also under 10 % of rated current so positive and negative commands behave alike. Threshold sensitivity of 0.5 % of rated current allows the valve to react to small input changes. Continuous operation is permitted up to 135 °C (275 °F), letting the unit endure high fluid or ambient temperatures. The port O-ring inside diameter is 18.77 mm (0.739 in) and its cross-section is 1.78 mm (0.070 in), matching the specified manifold groove to maintain a leak-free seal. The combined low threshold, limited hysteresis, and controlled symmetry provide stable closed-loop position control in electrohydraulic cylinders.
Technical Specifications
Burst Pressure (return Port Open)
250% of max supply
Electrical Connector
MS-3106-14S-2S (4 pin)
Hysteresis Around Null
3% of rated current
Integral Pilot Filter
35 µm (absolute)
Linearity Error
<10% of rated current
Max Operating Temperature
135 C (275 F)
Max Supply Pressure
210 bar (3000 psi)
Minimum Supply Pressure
14 bar (200 psi)
Mounting Port Circle Diameter
44.46 mm (1.75 in)
Port O-ring Cross-section
1.78 mm (0.070 in)
Port O-ring Inside Diameter
18.77 mm (0.739 in)
Proof Pressure (return Port)
100% of max supply
Proof Pressure (supply Port)
150% of max supply
Symmetry Error
<10% of rated current
Threshold
0.5% of rated current
Valve Weight (dry)
2.8 kg (6.2 lb)
1620 Old Apex Road
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