Product description:

GH-ZAZN type electric two-seat regulating valve accepts DC current signal from regulating instrument, changes the regulated sanction flow rate, and keeps the controlled process parameters at the given value. Widely used in electric power, metallurgy, chemical industry, petroleum, textile, pharmaceutical, paper and other industrial sectors of production automation control.

The nominal diameter of this series of products is from 20 to 200mm, the nominal pressure is 1.0, 1.6, 4.0, 6.4MPa, the use of temperature range from -250℃~450℃, the reception signal is 0~10mA.DC or 4~20mA.DC. Electric two-seat regulating valve is suitable for large pressure difference occasions. According to the sealing part of the valve, there are two kinds of metal - metal and non-metal - metal sealing (the leakage of the latter valve can reach VI level 9 zero leakage) standards. According to the different packing can be divided into general packing seal and bellows seal two kinds, the former is used for general occasions, and the latter is used for special occasions do not allow leakage. Flow characteristics are linear or equal percentage. With different actuators can be divided into ordinary type and electronic type two. A wide variety of specifications to choose from.

Product features:

The valve body is designed according to the principle of fluid mechanics with equal section and low flow resistance channel, and the rated flow coefficient is increased by 30%.

Adjustable range is large, the inherent adjustable ratio is 50, the flow characteristics are linear and equal percentage.

Electric two-seat regulating valve unbalance force is small, valve stability is good, the use of pressure difference.

Adjusting cut off type with soft seal structure spool, up to VI leakage standard (zero leakage).

Servo amplifier adopts deep dynamic negative feedback, which can improve the precision of automatic adjustment.

Electric operators come in a variety of forms and can be used for 4~20 ma.DC or 0~10 ma.DC.

Electronic electric regulating valve can be directly controlled by the current signal valve opening, without servo amplifier.

Bellows sealed type control valve to the moving stem to form a complete seal, blocking the fluid leakage.

Materials of parts:

Valve body, valve cover: HT200, ZG230-450ZG, 1Cr18Ni9Ti

Spool and stem: 1Cr18Ni9Ti, titanium alloy surfacing reinforced PTFE

Filler: polytetrafluoroethylene, flexible graphite

Bush: 2Cr13

Gasket: rubber asbestos rubber, 1Cr18Ni9Ti, asbestos winding gasket

Bellows: 1Cr18Ni9Ti

Connection standard:

Flange standard: Cast iron flange according to GB4216-84, cast iron flange according to GB9113-88, JB/T79-94

Flange sealing surface type: PN10, PN16 convex surface

PN40 and PN64 are concave and convex surface, and the valve body is concave

Structure length: GB12221-89

Jacket insulation type jacket carrying hot body interface: butt welding φ 18× 4

Valve body flange and flange face distance can be manufactured to user specified standards. Such as ANSI, JIS, DIN and other standards.