070011E
2Pages

CHECK VALVES without/with pilot control, hydraulic pilot operated, pmax. 500 bar Describtion: These hydraulic check valves are part of the spring loaded shut-off valves. The check valves serve for blocking the supply line in the application of leak-free hydraulic cylinders in combination with low leaking directional valves. The pressure drop in the consumer line takes place gradually. This prevents from decompression shocks and preserves the connected hydraulic elements. Operating conditions: By their design with manifold connection the check valves without/with pilot control facilitate fixtures without piping. Functionality: The flow B→A is permanently open. In the opposite direction A→B the flow is locked. It can be unlocked by pressurizing the control port Z. The minimum pressure for that depends on the pressure load at port A. The check valve with a capacity of 20 l/min is not equipped with a pilot control. The valve with a capacity of 50l/min is optional available without or with pilot control. In application with higher pressure and volume flow we recomment check valves with pilot control. The pilot control is effected by unlocking a seat valve in the main valve piston. Thereby a lesser control pressure is required to unlock the flow. By using a pilot control also clamping cylinders with unfavorable area ratio can be used. Uncoupled machine parts e.g. pallet systems can be kept pressurized by using these shut-off valves. Important notice: Faults can occur in the pressure ratio if the pressure load is too low to unlock the valve. This can effect dangerous malfunctions when decompressing swing clamp cylinders and pull cylinders. Such clamping cylinders must be operated with check valves equipped with pilot control. These valve types are designed for a much lower control pressure. To relieve the piston chamber, a drain connection is required. This must be protected from ingress of dirt and liquids. Webcode: 070011 Other designs are available on request Advantages: Installation without piping Pilot control prevents from decompression shocks Allows pressure maintenance at uncoupled machine parts Schematic symbols: Application example: Without pilot control With pilot control Pressure pA = [bar] (1) Order no. ERSV-500-5-003 (2) Order no. ERSV-500-8-001 (3) Order no. ERSV-500-8-002 (with pilot control) Minimum pressure pZ to unlock at pressure pA (pB = 0 bar) Hydraulische Komponenten GmbH Flow rate Q [l/min] Oil viscosity at measurement 60 mm²/s 700-11 / 02-13 *Subject to change without notice, compare issue no. at www.hydrokomp.de. Siemensstraße 16, 35325 Mücke (Germany) Phone: +49 6401 225999-0 Fax: +49 6401 225999-50 E-mail: info@hydrokomp.de Internet: www.hydrokomp.de

Check valves a b Only present at ERSV-500-8-002 Technical data: Type Max. volume flow (Qmax.) Max. operating pressure (A, B, Z) Max. operating pressure (L) Control volume Control volume pZ (pB = 0) Unlock ratio (pA/pZ) Mounting screws(1) Tightening torque a b c d e f g h i k m n q sØ O-rings(1) (A, B) O-rings(1) (L, Z) Weight approx. Order no.: (1) Scope of supply includes mounting screws and O-rings. 700-11 / 02-13 *Subject to change without notice, compare issue no. at www.hydrokomp.de.