Wennstrom • Gear pump with dual acting pressure relief valve • DN80 (3″) 400-1000 L/MIN

3.700,00 Excl. VAT

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Wennstrom • Gear pump with dual acting pressure relief valve • DN80 (3″) 400-1000 L/MIN 

Gear pumps

High reliability and robust design combined with active product development have given the Wennstrom gear pump a genuinely good reputation. The pump has been developed to meet the most varying installations and demands.


The latest addition is the double acting relief valve that permits the pump to be reversed thus allowing pipe and hose pipe systems to be emptied with ease. This reduces the risk for product contamination when the same installation is used for pumping different products or grades.

Many applications

The pump is mostly used within the petroleum distribution industry but has also, thanks to its versatility, found many other industrial applications.

It can be configured in eight different ways which simplifies installation and pipe layout. The pump can be powered directly linked to an electrical or hydraulic motor or a truck PTO. For truck and PTO installations the pump can be extended with a hydraulic pump to supply other power consuming equipment.

Relief valves and pressure control

To achieve the most optimized and safest working conditions the pump pressure can be set between 1.5 and the maximum permissible 10 bar.

This reversible version comes with pneumatic relief valve with a spring loaded plunger. The pressure in the primary pumping direction is controlled by a pneumatic regulator. In the reverse direction the pump pressure is set by a spring. The relief valve can be opened by shutting off the pneumatic pressure. This will enable fast degassing of a pipe system under gravity pressure.

The reversible 3” pump has the following relation between the pneumatic pressure and the opening pump pressure of the relief valve. To prevent the pump pressure from exceeding 10 bar (the maximum permissible pressure for a pipe system on a road tanker), the relief valve is designed to give 9.5 bar to a closed pipe system at a pneumatic pressure of 7 bar. Depending on the flow rate and the viscosity of the liquid the total pump pressure will exceed the opening pressure of the relief valve. For diesel oil the pump pressure is about 1 bar above the opening pressure. In reverse the pump will give a maximum pressure of approximately 5 bar.

Road tanker installations

The reversible pump is the best alternative in combination with Wennstrom’s other systems for road tankers. Together with the electronic gas separator FlowCheck the pump provides a fast and efficient degassing with gentle degassing stops and starts. This is particularly noticeable when discharging from a drawbar trailer through a pump fitted on the truck. Together with the electronic measurement system VolumeCheck the reversible pump can empty the delivery hose and make the handling of a long and heavy hose much easier.

Shaft seal

A well proven design with both teflon and graphite parts combined with teflon impregnated cotton braid. The seal is lubricated by the pumped liquid and can easily be tightened up which gives a very long life span. When required the seal is easily dismantled and new parts fitted.

Assembly configurations, flow and rotation directions

The three flange connections of the pump can be used as either in- or outlet and there are two possible shaft positions giving in total eight different assembly possibilities. Configurations one to four have a low fitted main shaft and five to eight come with the top placed shaft. When ordering please state both item number and the desired configuration.

For power requirements, capacity, pump graphs etc. Please see the data sheet attached below

Data sheet: Wennstrom Gear Pumps



Weight 70 kg





Yes, NO

Mounting form

1, 2, 3, 4, 5, 6, 7, 8

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Shipping Policy

1.1 For orders where the Seller is arranging transport and are delivering the goods at the buyers requested delivery address, the delivery terms are: DAP – Delivery At Place (Buyers delivery address) Incoterms® 2020. The Seller delivers the goods to a named place of destination, but is not responsible for unloading. His responsibilities include packing, export clearance, carriage expenses and any terminal costs up to the agreed destination. The Buyer is responsible for all costs, duties and taxes associated with unloading the goods. He is also responsible for clearing customs to import the products into the named country of destination.

1.2 For orders where the Buyer is picking up or arranging transport of the goods from Sellers address the delivery terms are: EXW - Ex Works (Sellers address) Incoterms® 2020. The Seller is responsible for making the goods available at its premises. The Buyer handles all costs and risk after the products are collected.

Cancellation / Return / Refund Policy

2.1 Orders can be cancelled until they have been shipped. However maximum 24 hours after the order has been placed.

2.2 Standard products kept in store by the Seller can be returned until 7 days after delivery. The returned products must be unused and in original packaging to be refunded. The shipping costs are non-refundable. Products produced to order cannot be returned and refunded.

2.3 Se how to initiate a return here.

Warranty Policy

3.1 The Seller warrants to the Buyer that all products delivered by the Seller are free of defects in relation to materials, design and finish (the \"Warranty\"). The Warranty applies for the warranty period for the specific product, and any claim from the Buyer under the Warranty must have been made in writing to the Seller within the warranty period. The warranty period for the product is specified on the MEMIDOS product page. The warranty period is counted from delivery of the product.

3.2 Complaints must be made in writing and be received by the seller no later than 6 working days after the
error/defect could have been discovered using general diligence. In all events, a complaint must have taken place before expiry of the warranty period.

3.3 In case of timely complaints, see 3.2, The Seller is obliged, at the Seller’s own choice, to redeliver or repair products not in compliance with the Warranty. This is the Buyer’s sole remedy in the case that supplied product are not in compliance with the Warranty or otherwise defective. The Seller is not obliged to pay the installation costs in the events where installation can usually be made by the Buyer.

3.4 The warranty only applies if the product has been handled, stored and used with the proper care, for the intended purpose and in compliance with applicable law, user instructions and other instructions from the Seller, and that the products supplied, have not been changed or otherwise modified in any way. No warranty is granted for wearing parts, and usual wear and tear are not covered by the warranty.

3.5 No warranty is granted to products that can be categorised as wearing parts or consumables.