Pressure Regulators, Dome-Loaded

Published on : Saturday 05-03-2022

Dome-loaded pressure regulators giving maximum pressure stability. The design makes the difference.

Dome-loaded pressure regulators can deliver highly stable outlet pressure. In these devices, the required outlet pressure is regulated by means of a gas cushion instead of a spring. The gas technology specialists at WITT have perfected this technology. But how does it work exactly, and where are the differences?

Dome-loaded pressure regulators are of enormous importance for the quality of the gas supply: Good dome-loaded pressure regulators control the gas pressure constantly even with fluctuating upstream pressures or flowrates, and can also allow high flow rates even with small pressure differences. Stable outlet pressure means a stable process downstream.
 
Gas cushion instead of a spring
In conventional gas pressure regulators, a simple spring provides the necessary counterforce to reduce the inlet pressure to the desired outlet pressure.

In dome-loaded regulators, on the other hand, the required counterforce is generated by gas pressure. The so-called pilot gas forms a kind of gas cushion and presses on a diaphragm, whose movement adjusts the main valve. The gas flowing through acts behind the valve seat as a counterpart to the pilot pressure on the diaphragm. The pilot pressure and the outlet pressure compensate for each other and achieve a stable equilibrium. The outlet pressure thus remains constant, even if the flow rate is fluctuating.

Pilot and dome pressure regulator in a single fitting
In dynamic systems, a separate pilot pressure regulator is usually used. The user simply adjusts the pressure applied to the dome pressure regulator at any time via the pilot pressure regulator, thereby controlling the required outlet pressure.

Uniquely, WITT has integrated the pilot pressure and dome pressure regulator into a single device, a complete solution that can be installed in any position, and includes pressure gauges. The compact regulator is fully assembled, tested and ready for immediate use. This means minimal space requirement, as well as rapid installation and low maintenance needs, with the corresponding time and cost savings for the user.

In addition, WITT regulators have some special features: The gas to be controlled is used as the control pressure. A separate gas source is not required - a particularly uncomplicated and cost-saving procedure thanks to this "own medium control".

WITT dome-loaded pressure regulators sense the working pressure via their so-called "Pilot Control Tube" in their outlet. In other words, exactly at the point that is relevant for accurate outlet pressure control. In addition, their "Balanced Seat Design" balances the valve position by means of the pressure on each side. Even with upstream pressure fluctuations, the outlet pressure remains constant for the user.

Furthermore, the diaphragm of WITT domes does not rest directly on the valve seat, but transmits its stroke movement via a special diaphragm plate. This is key to their highly precise pressure regulation.

WITT Gas India Pvt Ltd, Kolkata. Tel: 033-24010009.  Email: witt@wittgas.com, Tamal.Chakraborty@wittgas.com