Pneumatic film sleeve regulating valve Overview: ZJHM pneumatic film sleeve regulating valve is a kind of high performance, large capacity regulating valve products, using sleeve guidance, large guiding area, good stability, can quickly replace the valve internal parts online, high maintenance efficiency, saving manpower and time. Pneumatic film sleeve regulating valve because of its good stability, simple maintenance and widely used, pressure balance spool, eliminate most of the static unbalance force on the valve disc, and have a certain damping effect, can reduce the vibration caused by fluid flow, especially suitable for leakage requirements are not high, valve before and after the pressure difference is large occasions! Pneumatic film sleeve regulating valve features: 1, the use of balanced spool, unbalance force is small, allowed pressure difference is large, stable operation. 2, the spool guide surface is large, can improve the oscillation caused by eddy current and impact, and reduce damage. 3, than the ordinary single and double seat control valve noise reduction of about 10dB. 4, simple structure, convenient installation and disassembly maintenance. Pneumatic film sleeve regulating valve principle: Pneumatic film tube regulating valve is an important implementation unit of instrument in automatic control system, the use of electro-pneumatic valve positioner, electric signal and compressed air as power, accept the control system input (0-10mA DC or 4-20mA DC) current signal, the regulator will be compressed air, converted into air source pressure signal input and output, Thus changing the valve opening displacement, to achieve the pipeline fluid media flow, pressure, temperature, liquid level and other process parameters accurate regulation and control!
Pneumatic film sleeve regulating valve parameters: Valve body V-shaped through cast ball valve Nominal diameter 25. 32. 40. 50. 65. 80. 100. 125. 150. 200. 250. 300mm Nominal pressure PN16, 40, 64bar Flange standard JB/T79.1-94, 79.2-94, etc Material cast steel (ZG230450), stainless steel (ZGICr18Ni9Ti, ZGICr18Ni12M02Ti), etc Upper valve cover standard type: -17-230ºC Heat dissipation type: 230-450ºC Low temperature type: -60--196ºC bellows seal type: -40-350ºC Valve cover form bolt pressing type V-type PTFE packing, asbestos packing containing impregnated polytetracyanoethylene, asbestos textile packing, graphite packing Structure form sleeve type Valve inner assembly Spool type Pressure balanced spool Flow characteristics such as percentage characteristics and linear characteristics Material stainless steel, stainless steel stele alloy, titanium and corrosion resistant gold, etc. Pneumatic film sleeve regulating valve actuator: Actuator V-type ZHA/B multi-spring film actuator Type ZHA/B-22 ZHA/B-23 ZHA/B-34 ZHA/B-45 ZHA/B-56 Effective area cm2 350 350 560 900 1400 Stroke mm 10, 16 25 40 40, 60 100 Spring range KPa 20-100 (standard) 20-60 60-100 40-200 80-240 Diaphragm material Butadiene rubber sandwich nylon cloth, ethylene propylene rubber sandwich nylon cloth Gas supply pressure 140-400KPa Air supply interface RC1/4" Ambient temperature -30-70 ° C
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