Divisions menu Account menu

Rexroth Oil Control Hot Oil Purge Valve

Hot oil purge valves are used in closed loop hydrostatic transmissions to purge hot oil out of the low pressure side of the transmission loop. Often these valves are included in the pump or motor build so an additional inline valve is not required, but for installations where the pump and motor do not include a purge valve these valves can be used. A hot oil purge valve is better than using the boost pump relief valve to regulate the pressure on the low pressure side of the loop, as allow fresh oil in to the loop and bleeding off excess flow consisting of the hot oil from within the loop, thus reducing oil temperatures in the closed loop.

These hot oil purge valves include a freewheel valve and a back pressure relief valve. The freewheel valve, when opened will allow the motor to be turned. The back pressure relief valve, which often isn't included in other hot oil purge valves is required to set the minimum pressure in the low pressure side of the circuit. This is necessary in many transmission pumps require a minimum back pressure on the boost pump to make them work.

For more information or valves that are not listed here please call us on 01452 730 562 or email boschrexroth@grouphes.com
Ordering Description Price Quantity
R930004091 A-VSL-R-34-R
Hot Oil Purge Valve
G3/4" Ports
Type Code
with free UK delivery
R930004092 A-VSL-R-100-R
Hot Oil Purge Valve
G1" Ports
Type Code
with free UK delivery

Maximum Working Pressure: 350 Bar

Maximum Exhaust Flow:90lpm (so often suitable for transmissions up to 450 lpm)

Back Pressure Setting:5-25 Bar

Block Material:Zinc Plated Steel

Delivery Information and Returns Policy

Delivery Information :

Delivery charges apply.

If you require International Delivery charges will apply and you will need to contact enquiries@grouphes.com to process your order. 

Delivery will be Next Working Day wherever possible if the order is made before 4pm or 2pm for any order of oil.  Please allow up to 7 working days for any orders of 205 litre/45 gallons barrels of oil or 1000L IBCs. 


Returns policy:

You are entitled to cancel your order and return the product to any division of Group HES within 7 working days from delivery date.  After this date, it will be at the discretion of management to decide whether a refund or exchange will be given. A full refund is available if the item is unused, undamaged and in the original packaging. The item must not contain any fluids, including water, oil etc.

An average 20% (percentage may vary), handling charge will be applicable unless the part is faulty or incorrectly described. Any shipping costs will not be refunded.  

If you need to return an item, please contact admin@grouphes.com immediately with your order number and reason for return.

Please allow up to 30 days for refunds to be applied or alternatives to be resent out. The company reserves the right to assess whether there is any consumer error involved and will take this into account when refunds are granted.

Your statutory rights are not affected.

These terms are subject to change so do check back regularly. 

If you need to return an item due to warranty reasons - please refer to our Terms and Conditions and contact admin@grouphes.com or call 01452 730 774.