Vickers | SM4-201557-DCLTB-10
SM4-20(15)57-DCLTB-10
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The SM4-20(15)57-DCLTB-10 servo valve from Vickers belongs to the Servo Valves series and meters hydraulic fluid in closed-loop automation systems. It delivers a rated flow of 57 l/min (15 US gpm) at a 70 bar differential to regulate actuator speed with moderate capacity. The supply line must remain between 14 bar (200 psi) and 210 bar (3000 psi) to maintain spool stability under varying loads. Electrical input uses an A+ or C+ signal to direct flow out of port B, and connections are made through an MS-3106-14S-2S four-pin plug. A 35 micron absolute filter protects the first stage from particulate contamination, supporting consistent null bias over prolonged cycles.
During installation the mounting face must hold 0.025 mm (0.001 in) flatness with a 32 microinch finish to prevent leakage paths, and the port circle is 22.2 mm (0.875 in) to align with standard subplates. Elastomer seals feature a 1.78 mm (0.070 in) cross section and a 10.82 mm (0.426 in) inner diameter for proper compression at torque. The supply port tolerates proof pressure equal to 150 percent of the maximum rating, while the return leg survives burst conditions at 250 percent of that same reference. Continuous operation is acceptable up to 135 °C (275 °F), ensuring reliable flow control near heat-intensive power units.
Technical Specifications
Burst Pressure (return Port Open)
250% of max supply
Control Polarity
A+ or C+ Causes Flow Out B
Electrical Connector
MS-3106-14S-2S (4-pin)
First-stage Filter Rating
35 micron (absolute)
Maximum Operating Temperature
135 C (275 F)
Maximum Supply Pressure
210 bar (3000 psi)
Minimum Supply Pressure
14 bar (200 psi)
Mounting Surface Finish
32 microinch
Mounting Surface Flatness
0.025 mm (0.001 in)
Port O-ring Cross Section
1.78 mm (0.070 in)
Port O-ring Inner Diameter
10.82 mm (0.426 in)
Proof Pressure (supply Port)
150% of max supply
Rated Flow (at 70 Bar)
57 l/min (15 USgpm)
Valve Size Port Circle
22.2 mm (0.875 in)
1620 Old Apex Road
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