The standard electro-pneumatic positioners are Siemens , ABB or YTC positioners. The standard incoming signal is 4-20 mA and the increasing signal closes the valve. 

FENGCHI heavy duty Pinch Valve is a long-lasting and ideal valve, which is specially designed for shut-off and control applications involving abrasive or corrosive slurries, powders, or granular substances.

Size range: 

15~2000mm, ½~84in

Pressure range: 

1-10MPa, 1:2 safety factor, which means bursting pressure is 2 times higher than the operating pressure.

Material of valve body：

DN15~200 (carbon steel, ductile iron, aluminum alloy, stainless steel-casting process)；

DN250~2000 (45#steel, stainless steel welding technology )；

Material of valve sleeve：

NR, EPDM, CR(chloroprene rubber), NBR, butyl rubber, FPM, Hypalon rubber.