In-line pilot operated check valve RH HAWE

Non-return valves with hydraulic release belong to the group of block valves. They block one or both hydraulic consumer lines or serve as a hydraulically actuated drain or vent valve.

The RH type non-return valve is tight without oil leakage when closed. It is available with decompression. A decompression suppresses the relaxation shocks that can occur when the pressure is high and the volume of the consumer is high.

Properties and advantages:

- Pressures up to 700 bar.

- With pre-discharge for smooth switching.

Areas of application:

- Locking of the hydraulic cylinder without oil leaks.

GENERAL DATA

Designation: Non-return valve with release.

Type of construction: Ball seat valve under spring pressure, without recovery oil.

Constructive form: Online connection.

Material: Steel ball for bearings. Steel; galvanized valve box; Rectified hardened interior functional components.

Mounting position: Indistinct.

Hydraulic fluid: Hydraulic oil: according to DIN 51524 PART 1 -3; iso vg 10 TO 68 ACCORDING TO DIN ISO 3448: Viscosity range: min. AC. 4; max. AC. 1,500 mm ^₂ / s. Also suitable for biodegradable hydraulic fluids of the type HEPG (polyalkylene glycol) and HEES (synthetic ester) at operating temperatures up to approx. + 70ºC.

Cleanliness class: ISO 4406 (21/18/15 ... 19/17/13)

Temperatures: Ambient: approx. -40 ... + 80ºC, Oil: -25 ... + 80ºC, pay attention to the viscosity range. It will allow a start-up temperature down to -40ºC (pay attention to viscosities) when the constant end temperature in subsequent service is at least 20K higher. Biodegradable hydraulic fluids: Observe the manufacturer's data. Not higher than + 70ºC if the compatibility of the joints is taken into account.

OPERATING MODE

No decompression

Non-decompression versions have a ball valve element, which releases the entire flow section upon unlocking. The valves are suitable for all the most common uses. A throttle point in the control connection attenuates the modulating movement of the unlocking piston, whereby normal pressure surges (decompression strokes) are sufficiently suppressed. This effect can be enhanced with additional throttle elements in the control tubing.

Applications

• Maintain pressure: Protection of a pressurized cylinder chamber against loss of pressure due to a leak from the piloted manifold.
• Securing suspended loads: Safe movement when pulling loads.
• Return discharge: Handling larger flow rates for rapid cylinder movement and for protection against overloading of watertight solenoid valves.