Butterfly valves are valves with a circular body and a rotary motion disk closure member which is pivotally supported by its stem. A butterfly valve can appear in various styles, including eccentric and high-performance valves. These are normally a type of valve that uses a flat plate to control the flow of water. As well as this, butterfly valves are used on firefighting apparatus and typically are used on larger lines, such as front and rear suction ports and tank to pump lines.
Lug-style butterfly valveLug-style valves have threaded inserts at both sides of the valve body. This allows them to be installed into a system using two sets of bolts and no nuts. The valve is installed between two flanges using a separate set of bolts for each flange. This setup permits either side of the piping system to be disconnected without disturbing the other side.
A lug-style butterfly valve used in dead end service generally has a reduced pressure rating. For example a lug-style butterfly valve mounted between two flanges has a 150 psi pressure rating. The same valve mounted with one flange, in dead end service, has a 75 psi rating.
|
Table A |
Commercial Actuator Selection Chart for valve sizes 2" to 6" |
|
Valve Size |
Cv |
Base Valve Model |
Actuator Model Number/Maximum Close-off- PSI |
|
Two Position |
Modulating |
Two-way Differential Pressure (PSI) |
Three-way Differential Pressure (PSI) |
|
@90º |
@70º |
Two-Way |
Three-way |
50 |
100 |
150** |
50 |
100 |
150** |
|
2" |
60 |
52 |
RS2A-2 |
RS3A-2 |
ES142 |
ES142 |
ES142 |
ES142 |
ES142* |
ES142* |
|
EN177 |
EN177 |
EN177 |
EN177 |
EN177 |
EN177 |
|
2 1/2" |
151 |
107 |
RS2A-2.5 |
RS3A-2.5 |
ES142 |
ES142* |
ES142* |
ES142* |
ES142* |
EN310* |
|
EN177 |
EN177 |
EN310 |
EN310 |
EN310 |
|
3" |
262 |
175 |
RS2A-3 |
RS3A-3 |
ES142* |
ES142* |
ES142 |
ES142* |
ES142* |
EN310* |
|
EN310 |
EN310 |
EN310 |
EN310 |
EN310 |
|
4" |
647 |
453 |
RS2A-4 |
RS3A-4 |
ES142* |
EN310* |
EN310* |
ES142* |
EN310* |
EN310* |
|
EN310 |
EN310 |
|
5" |
1141 |
832 |
RS2A-5 |
RS3A-5 |
EN310* |
EN310* |
EN310* |
EN310* |
- |
- |
|
6" |
1580 |
1160 |
RS2A-6 |
RS3A-6 |
EN310* |
- |
- |
EN310* |
- |
- |
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.
