What is Spirax Sarco Houston?

Cougar USA is the Spirax Sarco rep in the Houston area. Spirax Sarco provides a broad range of fluid-control products, engineered packages, steam systems expertise, and site services for its diverse range of over 100,000 industrial and institutional customers. They help their customers optimize production capacity, reduce energy costs and emissions, improve product quality and enhance the safety of their operations. Spirax Sarco has strategically located manufacturing plants around the world including one near Houston in Pasadena, Texas.

What is Spirax Sarco PRV?

Well-designed steam systems produce clean, dry steam for delivery at high pressure — the best-quality steam at the lowest cost. Lower-pressure steam is usually needed at the point of use. Effective control demands an automatic valve that can reduce steam pressure accurately, reliably, and at a cost to suit the application. Like direct-acting pressure-reducing valves, these valves are self-powered. The pilot operation provides accurate control under large load-change conditions. Available in iron, cast steel, and stainless steel in sizes from 1/2″ to 8″.

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How does the 25P Pilot Regulator Works?

The Spirax Sarco pilot-operated pressure regulator works by balancing the downstream pressure against a control spring. This modulates a small valve head over a seat (the pilot). The flow through this seat is directed, in turn, to the main valve diaphragm, where it
modulates the main valve.

In order to achieve the most stable operating condition, an external pressure sensing line must be used. This allows downstream pressure to feedback to the underside of the pilot diaphragm, balancing the spring force, and causing the pilot valve to throttle. This settles the pilot valve, allowing a constant flow across the main diaphragm. This ensures that the main valve is also settled to give a stable downstream pressure.

When downstream pressure rises, the pilot valve closes, and pressure is released from the main valve diaphragm through the control orifice, to close the main valve. Any variations in load or pressure will immediately be sensed on the pilot diaphragm, which will act to adjust the position of the main valve, ensuring a constant downstream pressure.

How do Direct Operated Regulators work?

On start-up, upstream pressure, aided by a return spring, holds the valve head against the seat in the closed position.

Downstream pressure is set by rotating the hand wheel in a clockwise direction which compresses the control spring and extends the bellows. This downward movement is transmitted via a push rod, which causes the main valve to open.

The steam then passes through the open valve into the downstream pipework and also surrounds the bellows.

As downstream pressure increases, it acts through the bellows to counteract the spring force and closes the main valve when the set pressure is reached. The main valve modulates to give constant pressure.