Established in 1993, Guanfa Valve Manufacture Co., Ltd. is specialized China proportional valve manufacturer and distributor of valves, hoses, tubes and pipes. Our oem proportional valves are suitable for acid, alkali, water, steam, seawater, coal gas and natural gas. They are widely used in petroleum, chemical, paper making, fertilizer, brewing and metallurgy. The use of specialized software of Pro/E and CAD has shorted the P&D and trial manufacture cycle, and greatly improved the service life and dependability of products. Our high-quality products have been exported to the North Amercia, UK, USA, Germany, Italy, India, France, Australia, Japan.

In the past, proportionality in valves was accomplished by using a proportional solenoid or dithering an on/off solenoid. There are two types of proportional solenoids. One uses a pulse-width modulated (PWM) electrical input signal to eliminate the effects of stiction. This reduces the frequency response of the valve. The second type of proportional solenoid eliminates stiction by suspending the moving part (the armature) to eliminate metal-to-metal contact. While this has been the preferred choice, it involves a complex design and is expensive to manufacture. Dithering puts more burden on the complexity of the electronic circuitry and still does not yield the linearity needed in most closed-loop applications. For these reasons a truly proportional, more sophisticated, proportional solenoid such as IQ Valves's is preferred.

Proportional valve solenoid for sphygmomanometer. Test position: Horizontal. Rated voltage: 0 to 3VDC / 6VDC. Rated current: 100mA RE. DC resistance: 30ohms / 57ohms (at 25°C) ±10%. Rated power consumption 0.330w. Use pressure: 300mm Hg maximum. Use temperature: 0 to 45°C. Insulation grade: A - class. Use fluid: Air. Release speed: 3mm hg 5mm hg/second (at 100ml tank from 230mm hg to 30mm hg). Leakage: 2.2VDC supply to solenoid with 100ml tank, pressure is 200mm hg. 3.0VDC supply to solenoid with 100ml tank, pressure is 300mm. Pressure reduction above shall be low than 4mm Hg/minimum.
Exhaust speed: Pressure reduced to 15mm hg is 3 seconds maximum at 100ml tank with 260mm hg pressure. Engineers at IQ Valves have advanced the proportional valves by designing units that meet the high performance end of all the above mentioned specifications while keeping the valve simple enough to hold costs down.

Go to China Valve Manufacturer Catalog or China Valve Catalog to find more China Products!