Eaton Vickers SM4-10/12/15 Servovalves

Eaton Vickers SM4-10/12/15 Servovalves

Flows to 57 l/min (15 USgpm) — Pressures to 210 bar (3000 psi)

Introduction

Vickers SM4-10/12/15 servovalves can provide system closed loop control with exact positional accuracy, repeatable velocity profiles, and predictable force or torque regulation.

Typical applications include plastic injection molding and blow molding systems, test and simulation equipment, die casting machines, hydraulic press brakes, animation and entertainment equipment, oil exploration vehicles, and lumber machinery.

The three models in this size of the high performance SM4 series offer a wide range of rated flows from 3,8 to 57 l/min (1.0 to 15 USgpm) at △p of 70 bar (1000 psi).

The SM4 is a two-stage, modular design, flow control valve which can be manifold or subplate mounted. A

symmetrical, dual coil, quad air gap torque motor is integrally mounted to the first stage nozzle flapper pilot valve with six screws. The second stage utilizes a four-way sliding spool and sleeve arrangement with a mechanical null adjust. Spool position is fed back to the first stage by means of a cantilever

spring. An integral 35 micron (absolute) filter protects against contamination of the pilot stage.

An SM4 servovalve, used with a hydraulic cylinder, position transducer, and appropriate electronics, can provide infinite cylinder position control to within 0,025 mm (0.001 in) or better (depending on component selection, length of stroke, and load characteristics).

When applied with servo hydraulic motors, tachometers, and appropriate electronics, the SM4 provides infinite proportional flow control for real-time velocity/acceleration profiles that can be closed loop error corrected to within one-tenth of a revolution per minute.

With appropriate pressure transducers or load cells, cylinders, and electronics in force control applications, the SM4 offers exact load pressure/force control and excellent system stability with pressure and load to ±1% full scale.

The field-proven design of the SM4-10/12/15 servovalves, combined with Vickers precision manufacturing techniques, provides you with the optimum in system control.

Features and Benefits

lThe wide range of SM4 flow capabilities allows selection of the valve size best suited for an application.

lThe high strength aluminum alloy of the second stage valve body means lighter weight with rugged durability.

lThe symmetrical, dual-coil, quad air gap, dry torque motor in Vickers servovalves, with its extremely fast response to input signals, can produce highly accurate control profiles.

lHigher frequency response — available on request — provides enhanced system bandwidth for critical performance requirements.

lAn integral 35 micron (absolute) filter provides extra first stage contamination protection.

lThe spool and sleeve are hardened stainless steel to minimize wear and erosion. The O-ring mounted sleeve eliminates spool binding and ensures smooth operation.

lCustomized spool lap and sleeve porting are available to provide the specific flow control required for special applications.

lThe SM4’s symmetrical design provides inherently dependable metering of control flow with minimum null shifts. The result is more consistent machine operation.

lViton* seals are standard.

lThe flexibility of standardized port circles, mounting patterns, and adapter manifolds makes Vickers

servovalves a cost-effective choice for replacing existing servovalves and enhancing existing systems.

lThe SM4 features a simple interface to an available dual filter module that provides extra protection against pilot contamination.

lFlushing valves are available that can greatly reduce initial system contamination levels prior to SM4 installation.

Model Series

SM4-10 SM4-12 SM4-15