In-line piloted check valve RH V HAWE

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

Construction Type: Spring Pressure Ball Seat Valve, No 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 HEPG (polyalkylene glycol) and HEES (synthetic ester) type 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 starting temperature of up to -40ºC (pay attention

to viscosities) when the constant end temperature in subsequent service is at least 20K higher. Biodegradable hydraulic fluids: Observe the data of the

manufacturers. Not higher than + 70ºC if the compatibility of the joints is taken into account.

Operating mode

With decompression

On the decompression versions there is a spherically ground valve piston (poppet function) with a built-in small ball check valve instead of

the ball. This piston opens with force when unlocking even before opening and releases a choke cross section. This results in shock-free decompression of the

consumer volume. These valves are mainly used when the operating pressures are high and the consumer volume is large. Decompression is more effective when

the lower the opening speed of the control piston. This effect can be enhanced with additional choke elements in the control tubing.

Applications

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

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