Initial Pressure Controller for the control of a constant initial pressure in a plant, for use in the food and pharmacy sectors. To be used in conjunction with pressure reducing valves for maintaining a constant pressure in the pressure vessel.

Initial pressure controllers are independent of the after-pressure and, depending on the pressure range, are either piston or membrane controlled, spring-loaded proportional controller. They are used to maintain the initial pressure at a constant, adjustable set value and for the discharge of the excess in the reduced pressure pipe or to the outside.
If the pipeline or the pressure vessel is depressurised and the spring is pre-tensioned, the membrane is pushed with the piston plate and disc against the seat; the controller is closed in this position. The initial pressure to be regulated acts on the membrane and generates an opening force that is compared to the adjustable spring force (set value) above the membrane. When the initial pressure reaches the set value, the forces are balanced and the initial pressure controller begins to open. If the initial pressure increases further, the opening force dominates and the disc lifts up from the seat. The medium flows between the seat and the disc and is discharged. The initial pressure controllers remains open as long as the initial pressure is above the set value. If the initial pressure decreases to the set value due to the discharged flow rate amount, the initial pressure controllers closes again.


Initial Pressure Controller for foodstuffs and pharmaceutical industries and other industrial are vac pressure relieved and depending on the primary pressure range either piston or membrane controlled proportional valves with spring load or optionally air load.

They are used to keep a required pressure P1 at a constant adjustable reference value with valve will be opened when pressure meet or over than P1, and superfluous pressure will be relieved by P2, that can be understand as a back pressure valve.

Nominal pressures : PN 1.6 to PN 180
Connections : G 1/4 to G 4 or DN 8 to DN 100
Process connections : normal commercial thread, screw, clamp or flange connections
Materials : 1.4301, 1.4571, 1.4404, 1.4435, as well as elastomer and thermo plastic element seals
Primary pressure ranges P1 : 0.005 bars to max. 104 bars
Flow mediums : gases, steam and liquids