U200 Series:- Upstream Pressure Control Valve ie BACK PRESSURE REGULATING VALVE

The U200 series are pilot operated self actuated globe type medium pressure back pressure regulating valves meant to regulate the inlet pressure at pre-determined set value required for the processes/equipment protection.

Movement occurs as pressure variations register above the diaphragm of main regulator. The registering pressure is the inlet or upstream pressure. The inlet pressure acts on the diaphragm of the pilot. Pilot is an upstream pressure control valve which opens in the event of high upstream pressure than its set pressure. Rise in inlet pressure above the set pressure opens the pilot affecting the main valve to open and flow to take place. The pressure is apply on the diaphragm in main regulator through pilot valve, it pushes the diaphragm down of main regulator, an opens the port. As inlet pressure is compensated, the pilot valve get closed, diaphragm in main regulator moves up due to spring force and port opening closes.

FEATURES

These are designed to respond to the smallest rise in pressure at inlet and allow the excess pressure at outlet affecting protection of equipments and helping the efficiency of equipments like pumps and compressors. These are also used as Pressure Holding Valves as they hold the pressure at upstream.

This series of pressure regulating valves are self actuated or self contained and hence, do not require any external energy like pneumatic air or electricity to operate.

The impulse sensing is internal ie through the valve body itself avoiding the impulse tubing for sensing.

The inlet pressure directly acts on the diaphragm to counter balance the spring force affecting efficient response capability and accuracy.

The maintenance and inspection of the pressure regulating valve internals is possible without removing body from pipe line.
As a standard we provide trim material as AISI 316. Wide range of material is available to suit various services for different process fluids including corrosive fluids. NACE compliance can be provided for sour services.
Cap and adjusting screw discourage on-field tampering of the pressure setting.
Combination of metallic and soft seat enables the leakage class VI as per ANSI FCI 70.2.
The general replacement parts are polymer parts like Diaphragm, Soft Seat & O Rings only and thus the maintenance cost is very low.

MATERIAL OF CONSTRUCTION

CS A216 Gr WCB (standard), CF8, CF8M, Aluminium, CF3, CF3M, WC6, WC9, LCB, LCC, AlumBronze, Monel, Inconel or any other material on request.
St St316 (standard), St St304, 316L, Monel, Inconel, Hastelloy B/C or any other material on request
BunaN (Nitrile), Neoprene, Fluroelastomer (Viton), PTFE or any other material suitable for process / on request
Reinforced Polymers like Buna N (Nitrile), Neoprene, Fluroelastomer and PTFE
Carbon Steel IS4454 Gr.II / III, H12, EN47, SS302, SS316, Inconel X750 or any other material on request.

Fabricated Steel (Standard) and other on request.

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