ntroduction of bellows seal valve:
Bellows control valve is a pressure balance valve. Body compact structure, fluid channel S streamline, pressure loss is small, large flow, adjustable range.
The valve cover using wave tube seal structure, can completely eliminate the possibility of leakage of the process media from the valve stem movement gap, which is one of the salient characteristics of bellows seal valve. Due to the deformation of the bellows itself and the outstanding aging resistance, this control valve completely overcome the stuffing seal valve usually exists in the aging of the filler and temperature sensitivity and other weaknesses. Secondly, the use of corrugated pipe packing double seal structure, better safety and reliability. Therefore, it is widely used in the automatic control system of rare and special medium, such as highly toxic, corrosive and radioactive. The control valve is equipped with multi spring diaphragm actuator, which has compact structure and large output force. Leakage: metal seat: Standard ANSIBl6.104 VI, less than the rated Cv 0.5 percent; PTFE seat: Standard ANSIBl6.104VI, Cv 10-7 is less than the rated return difference: 5 percent (not with a locator); 3 percent (with linear locator): + 11% (without positioning device);. 3 percent (with a locator) Note: V PTFE standard.
Main technical parameters:
valve body
Straight through casting ball valve
Flange standard GB/T9113, JB/T79
Connecting flange (FF RF RTJ), welding (SW BW), thread (suitable for less than 1)
Valve cover standard form - 17 to 230 degrees C, high temperature +230 ~ 450 DEG C, low temperature - - - 60 - - 196 degrees, bellows sealed -40 - C
Sealing filler type V PTFE filler, containing PTFE impregnated asbestos packing, asbestos textile packing, graphite packing
Valve internals
Spool type single seat plunger type, cage oriented, sleeve balanced spool
Linear and equal percentage flow characteristics
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