Low pressure reducing valveZM-R/D100, SST

Dome loaded reducing valve (D)

Description

Low pressure reducing valves control secondary pressure (p2, behind valve). Low pressure reducing valves ZM-R/D100 are controlling protective gas or inert gas to isolate processes from contamination by atmospheric oxygen.

Technology

ZM-R/D100 is a spring loaded differential pressure regulator with reference to ctual atmospheric pressure via a sensor hole to ambient. Under non operating conditions,the atmospheric pressure and the adjustable range spring and a stem hold the double-valve open. Under operating conditions, gas enters from primary (p1) through the valve and reaches counter side of diaphragm via a pulse line. As a result, the differential pressure is exactly in balance with the force of adjustable range spring.Double-valve will be closed as soon as secondary pressure (p2) raises set point of adjustable range screw. Valves will be open again, with secondary pressure below set point. Valves seat tightness is at least according to VDI/VDE 2174. The pulse line is compensating dynamic pressure drop. Best performance with pick-up directly on process or at least 300 mm behind unit. Optional D-connection is used for pilot line connection in case of dome loaded service (high pressure blanketing). ZM-R/D100 is vacuum-proof, manufactured in decreasing design and uses no external energy. ZM-R/D100 units are performing with connected pulse line only.

Application

The low pressure reducer ZM-R/D100 works similar to LPS. But in addition, a dome pressure of up to 2000 mbar relative can be applied via “D-connection”. So the regulator can be used with higher reference pressure to "blow-out" vessels for example. A pneumatic control unit can be offered and delivered accordingly.