the structure of valve body decided the valve and pipeline, valve body and bonnet. The valve can be used in casting, forging, forge welding the blank, aluminothermic welding and tube sheet welding, etc. Cast body is generally used in & ge; (the size, commonly used in forging body & le; (size, forge welding body used to trouble the whole forging process, and is used for important occasions of valves, cast joint valve is used to integrally cast does not meet the requirements of, available aluminothermic welding structure.

are connected to the valve body (2) the cover and put pressure to the valve body cavity of main pressure parts, with the stuffing box. For medium and small diameter valves, Industrial Valves cover is equipped with supporting stem nut or transmission device and other parts of body.

(3) stents are connected to the valve cover, stem nut used for supporting or transmission parts.

(4) stem and stem nut or drive directly, polished rod part with packing seal, transmission torque can play the role of a gate opening and closing, according to the position of the valve stem threads and clear lever gate and non-rising stem gate valves.

。 Smell rising stem valves, valve stem make lifting movement, its transmission thread on the outside of the body cavity of valve. The rise and fall of the valve stem is through the stem nut rotation on the cover or stent, stem nut only rotation, up and down without displacement, as shown in figure 2 1, good for stem lubrication, the gate opening is clear, the stem thread and stem nut do not contact with the media, not affected by temperature and corrosive medium, which is used more widely.

b。 Rotation of the non-rising stem gate valve: the valve stem, its transmission thread inside the body cavity of the gate. Is the rise and fall of the valve stem driven by rotating the valve stem disc to the stem nut on the implementation, the valve stem can turn, and no displacement of the up and down, see figure 2 3, the height of the Industrial Valves size is small, its opening and closing schedule is hard to control, need to increase the indicator, the stem thread and stem nut contact with the media, to be affected by temperature and corrosive medium, and thus is suitable for the corrosive medium as well as the external environment condition is poorer.

5. Stem nut and stem thread group constitute parts of moving pair, can directly connect with transmission device, can transfer torque.

6 transmission can be directly pass electrical, pneumatic, hydraulic, and manpower to stem or stem nut. In the power plant often use the handwheel, bonnet, actuator and the connecting shaft and universal coupling to drive at a distance.

7 seat with methods such as rolling, welding, threaded connections would seat fixed on the valve body and disc of the sealing parts. Seat sealing can according to customer's requirements in welding metal forming sealing surface directly on the body. For cast iron, austenitic stainless steel and copper alloy valve, can also work out sealing surface in the valve body directly.

packing into the stuffing box ( Stuffing box) , prevent medium along the valve stem leakage of filler.

gland by bolts and nuts to compress packing to prevent medium along the valve stem leakage parts.

the gate is opening and closing a gate valve, gate valve opening and closing and sealing performance and service life depends mainly on the damper, it is the key to the smell of valve control pressure parts. According to the structure of ram can be divided into two broad categories.

。 Parallel gate valve: gate two sealing surface parallel to each other, and the channel center line perpendicular to the valve body. It can be divided into parallel type single ram and parallel type double ram two kinds.

b。 Wedge gate valve, sealing surface and ram vertical axis symmetry with a certain Angle, called half wedge Angle. The size of the half wedge Angle mainly depends on the temperature of the medium and the size of the size, the higher the general medium temperature, the size, the greater the take half wedge Angle is smaller, by common wedge half Angle of the wedge is 252 and 5 & deg; Two kinds. Model gate, single double ram disc and flexible disc and mode.

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