The SCHROEDAHL pump protection valve (Automatic Recirculation valve)

SCHROEDAHL invented the pump protection valve and is the world market leader in this sector.

Pump protection valves are required to ensure the minimum flow rate of a pump at all times. This protects the pump against overheating, cavitation and finally, destruction. If the flow through the pump falls below a certain level the bypass system opens and the fluid will be recirculated providing the required minimum flow for the pump.

The SCHROEDAHL- pump protection valves work in a modulating way. Should the discaharge increase through the following processes, then the amount of fluid recirculated by the bypass is automatically reduced- and vice versa. This increases the efficiency of the entire system and optimises the economy in the low-load operation.

The pump protection works entirely over the inside valve technology. The volume by which the process decreases is measured independent of the pressure – the amount returned over the bypass is adapted automatically. 

 

Pump Protection Valves - Overview

Type MRM

  • Max. PN #4500 / PN 640
  • Forged Body
  • High Pressure Let Down
  • Bypass Device (up to 7 Stages)
  • E. g. Offshore Applications

 

 

 

Type SUL

  • Max. PN #300 / PN 63/64
  • Cast Body
  • Economic and Sufficient Design

 

 

 

 

Type TDL

  • Max. PN #300 / PN 63/64 in except. PN #600 / PN 100
  • Forged Body
  • Check Valve in the Bypass
  • Venturi Ring Design

 

 

 

 

Type TDM

  • Max. PN #2500 / PN 400
  • Forged Body
  • High Pressure Let Down
  • Bypass Device (up to 5 Stages)

 

 

 

 

Type TDC

  • Max. PN #2500 / PN 400
  • Forged Body
  • Descaling Application