VR
15Pages

Pre-load check valve type VR Product documentation Screw-in valve Operating pressure pmax: Flow rate Qmax:

© by HAWE Hydraulik SE. The reproduction and distribution of this document as well as the use and communication of its contents to others without explicit authorisation is prohibited. Offenders will be held liable for the payment of damages. All rights reserved in the event of patent or utility model applications. Brand names, product names and trademarks are not specifically indicated. In particular with regard to registered and protected names and trademarks, usage is subject to legal provisions. HAWE Hydraulik respects these legal provisions in all cases. Printing date / document...

Overview of pre-load check valves type VR Pre-load valves, also called sequence valves are a type of pressure control valve. They generate a largely constant pressure drop between the inlet and outlet on the valve. In the opposite direction the ow can pass freely. In the normal position the valve has minor leakage. The sequence valve type VR is available as a screw-in valve and in a housing version for in-line installation. The primary application area is in return lines for oscillation damping, mainly in lifting equipment, lifting platforms, handling systems and in lifting gantries as...

Available versions, main data Free ow in direction F d V Flow rate pre-loaded in direction V d F Order coding example: VR 33 VR 25 VR 47 27 Basic type and size Table 2 Versions Table 1 Basic type and size Table 1 Basic type and size Basic type and size Volumetric ow (reference value) Qmax (lpm) Pre-load pressure SpV d F (opening pressure) (bar) 3 Note Thread equivalent ISO 228-1 or DIN 13 T6 (metric).

Table 2 Versions Model Circuit symbol Screw-in valve C Tapped journal on one side E Pipe connection on both sides G Note No housing version for screw-in cartridge with metric thread.

General Designation Pre-load valve (sequence valve) Ball valve Screw-in valve, housing version Steel; nitrided valve housing, electrogalvanised sealing nuts and connection block, hardened and ground functional inner parts Balls made of rolling bearing steel Screw in cartridge C up to end of the thread and tighten (wedging effect); for tightening torques see Chapter 4, "Dimensions" Installation position Flow direction Single valves blank, housing version electrogalvanised Hydraulic uid Hydraulic oil: according to Part 1 to 3; ISO VG 10 to 68 according to DIN ISO 3448 Viscosity limits: min....

Pressure and volumetric ow Operating pressure Static overload nominal volume 15 to 120 lpm, see Chapter 2, "Available versions, main data", Table 1 Characteristic curves Oil viscosity approx. 50 mm2/s Leakage ow (cm3/min) below the opening pressure; reference valve (thread section approx. 30%) Volumetric ow Q (lpm) above the opening pressure (pre-loaded) Flow direction F d V (free ow)

All dimensions in mm, subject to change. Screw-in valve VR ... C Note Screw in VR..C up to end of the thread and tighten (see tightening torque). Type

Special thread seal 4.1 Creating the mounting hole

Assembly, operation and maintenance recommendations 5.1 Intended use This valve is exclusively intended for hydraulic applications (uid engineering). The valve demands high technical safety standards and regulations for uid engineering. The user must observe the safety measures and warnings in this documentation. Essential requirements for the product to function correctly and safely: – All information in this documentation must be observed. This applies in particular to all safety measures and warnings. – The product must only be assembled and put into operation by qualied personnel. –...

5.3 Operating instructions Product configuration and setting the pressure and ow rate The statements and technical parameters in this documentation must be strictly observed. The instructions for the complete technical system must also always be followed. Note ■ ■ ■ Read the documentation carefully before usage. The documentation must be accessible to the operating and maintenance staff at all times. Keep documentation up to date after every addition or update. Caution Risk of injury on overloading components due to incorrect pressure settings! Risk of minor injury. ■ Always monitor the...

Accessories, spare parts and separate components 6.1 Order coding for housing Type Housing construction Fitting seal

Further information Additional versions ■ ■ Pressure-limiting valve type MV, SV and DMV: D 7000/1 Pressure-limiting valve and pre-load valve type MVG, MVE, and MVP: D 3726 Pressure valve type CMV, CMVZ, CSV and CSVZ: D 7710 MV HAWE Hydraulik SE Einsteinring 17 | 85609 Aschheim/München | Postfach 80 08 04 | 81608 München | Germany Tel +49 89 379100-1000 | Fax +49 89 379100-91000 | info@hawe.de | www.haw