Design and principle of operation
The excess pressure valve consists of a bal-anced control valve and a closing actuator
Equipped with springs and an operating dia-phragm. A pilot valve with a strainer, needle Valve and condensation chambers is at-tached to the excess pressure valve.
The excess pressure valve is designed to Maintain the pressure upstream of the valve To a set point adjusted on the pilot valve.
The valve opens when the upstream pressure Rises.
The medium flows through the free area be-tween the seat (2) and the plug (3) in the di-rection indicated by the arrow. The plug posi-tion determines the upstream pressure (ex-cess pressure) to be controlled.
In order to achieve this excess pressure as re-quired, different forces are compared. These Are produced by the upstream pressure p1 Acting on the top surface of the diaphragm(7), by the control pressure PS (determined by
The pilot valve and the needle valve) acting on The bottom surface of the diaphragm and by The actuator springs (8).
When the upstream pressure (p1) rises, the Pilot valve (10) opens further and this causes The differential pressure (p
1 PS) to rise at the Operating diaphragm. The actuator and plug Stem move in the opening direction against The force of the actuator springs (8) until a New pressure equilibrium is reached and the Upstream pressure (p 1) corresponds again to The set point adjusted.
If the upstream pressure starts to decrease, The process described above is reversed. The Pilot valve closes further, causing the differen-tial pressure (p1 PS) to decrease again and the actuator spring force has more effect. The Valve plug also moves in the closing direction Until the set point is reached.
Shanghai ThinkTank Process Management Co., Ltd. is the sole production and R&D institute of Taiwan STONE Company in Mainland China. ThinkTank entered Chinese market in 2002 and moved from Hangzhou to Shanghai headquarter in 2012. Based on over 30 years experience in researching and manufacturing automatic instruments, brining in overseas advanced technology and combining domestic users real working situation, ThinkTank is specialized in producing new typed self-regulating valves, control valves and various kinds of automatic instruments. ThinkTank's business includes engineering projects such as electricity, metallurgy, petrochemical processing, light industry and building materials, municipal water service and natural gas.
Enterprise history
1985.08 Taiwan STONE company was established in Taipei city.
1990.02 Sales network covered Southeast Asia.
2002.06 Branch office was fund in Hangzhou, Zhejiang, handling all business in China
2012.10 Mainland head office was moved to Pudong, Shanghai
Shanghai ThinkTank Process Management Co., Ltd. Has a professional team works for control valves design and engineering application. ThinkTank develops a series of hi-tech products after absorbing overseas advanced technology and innovating.
*New self-regulating, micro pressure, differential pressure, flow, temperature control valve
*New pneumatic (electric) linear actuator (low dB, high pressure) control valve
*Pneumatic (electric) rotary actuator (O/V ball, butterfly) control valve
*Pneumatic (electric) special corrosion resisting control valve
Shanghai ThinkTank Process Management Co., Ltd sticks to the policy of "client oriented, quality comes first, and faith is root". Depending on many years experience on engineering application in various industries, ThinkTank provide clients with good, reliable full service, focusing on maximizing the rate of return on investment for clients.
