Type TDL/TDM Automatic Recirculation Valve

If the flow through the system is or falls below a certain level, the bypass system opens automatically and the fluid is recirculated, providing the required minimum flow for the pump. Special operation requirements, low load cases, complicated commissioning situations and the pressure in the bypass line have an impact on the valve design and therefore are typically part of customers RFQ information - SCHROEDAHL can offer solutions at a very high level. 

The SCHROEDAHL automatic recirculation valve is therefore a high quality, cheaper and easier solution for clean liquid pump protection - more cost effective than a conventional modulating control valve package.

The TDL consists of the check valve section with bypass configuration type L. The lever controls the position of the bushing, which in turn opens or closes the holes in the control head. The minimum flow is thereby bypassed in a modulating way. Applicable for differential pressures up to 40 bar. Standard with non-return function.

The TDM consists of the check valve section with bypass configuration type M. The movement of the lever is transmitted via a piston to the multi-stage vortex plug. The minimum flow is then bypassed in a modulating way over several pressure reduction stages. Applicable for differential pressures from 20 to 230 bar. The standard TDM design has a built-in bypass non-return function (~2 bar dp level required).