Supply new national standard gate valve za40h manufacturer wholesale

  Supply new national standard gate valve za40h manufacturer wholesale one; sketch;
The opening and closing part of za40h new national standard gate valve is the ram
The movement direction of the ram is perpendicular to the fluid direction, and the gate valve can only
Fully open and fully close, without adjustment and throttling
The ram has two sealing surfaces
In the common mode, the two sealing surfaces of the ram valve form a wedge, and the wedge angle varies with the valve parameters, usually 50
When the medium temperature is not high, it is 2-deg; 52 。 The gate of wedge gate valve can be made into a whole body, which is called rigid gate; It can also be made into a ram that can produce slight deformation to improve its manufacturability and make up for the deviation of sealing degree in the processing process
This kind of ram is called elastic ram

The new national standard gate valve is also called lifting rod gate valve (also known as rising rod gate valve)
Generally, there are trapezoidal threads on the lifting rod
Through the nut on the top of the valve and the guide groove on the valve body, the rotary motion is changed into linear motion, that is, the operating torque is changed into operating thrust
When the valve is opened, when the lifting height of the ram is equal to 1:1 times of the valve diameter, the fluid channel is completely unblocked, but this position cannot be monitored during operation
In actual use, the vertex of the valve stem is used as the mark, that is, the position that cannot be opened is used as its fully open position
In order to consider the locking phenomenon caused by temperature change, it is usually opened to the peak position and then turned back 1 / 2-1 turn as the position of fully open valve
Therefore, the fully open position of the valve is determined according to the position of the RAM (i
e
stroke)

II; General requirements for za40h new national standard gate valve ,
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1 the specification and category of new national standard gate valve shall meet the requirements of pipeline design documents

1
2 the model of new national standard gate valve shall indicate the national standard number requirements
If it is an enterprise standard, the relevant description of the model shall be indicated http://www
shjbn
com/2006111794744P3995
htm  ;
1
3 working pressure of new national standard gate valve, requirements ≥ For the working pressure of the pipeline, on the premise of not affecting the price, the allowable working pressure of the valve shall be greater than the actual working pressure of the pipeline; When the elastic seat seal gate valve is closed, either side shall be able to withstand 1
1 times the working pressure of the valve without leakage; When the valve is open, the valve body shall be able to withstand twice the working pressure of the valve

1
4 the manufacturing standard of new national standard gate valve shall state the national standard number on which it is based
If it is an enterprise standard, the enterprise document shall be attached to the purchase contract

III; Za40h new national standard gate valve standard quality
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1 the valve body shall be mainly made of nodular cast iron, cast steel, stainless steel and 316L, and the brand and the actual physical and chemical test data of cast iron shall be indicated

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2 the material of valve stem shall be stainless steel (2Cr13), and the large-diameter valve shall also be stainless steel embedded valve stem

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3 the nut is made of cast aluminum brass or cast aluminum bronze, and its hardness and strength are greater than that of the valve stem

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4 the hardness and strength of the valve stem bushing shall not be greater than that of the valve stem, and there shall be no electrochemical corrosion with the valve stem and valve body under the condition of water immersion

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5 material of sealing surface
① the new national standard gate valves have different types and different sealing methods and material requirements;
② for ordinary wedge gate valve, the material, fixing method and grinding method of copper ring shall be described;
③ physicochemical and hygienic test data of soft seal gate valve and valve plate rubber lining materials;
IV; Parameters of za40h new national standard gate valve
Material: stainless steel cast steel
Service pressure; 1
6MPa
Applicable medium: Water Liquid General corrosivity of gas; wait!
Nominal diameter: dn15-300mm
Service temperature: 425 ℃ for cast steel and 150 ℃ for stainless steel
When ordering beyond this provision, it shall be explained