cast steel gate valve manufacturer

cast steel gate is one of the most commonly used shutoff valve is mainly used to connect or cut off the pipeline of medium, not suitable for regulating the flow of medium. Cast steel gate valves are suitable for all kinds of pressure, temperature and caliber, especially suitable for medium and large diameter pipeline. Sealing surface using asbestos, graphite and flexible graphite, operation mode for manual, gear drive, electric, pneumatic, etc. , suitable for water, steam, oil medium pipeline. Compact structure, reasonable design, rigidity, valve flow is smooth, small flow resistance coefficient. Sealing surface for the stainless steel or hard alloy, long service life. The utility model adopts the asbestos graphite and flexible graphite, reliable sealing, gentle operation. Can be used in a variety of standard piping flange and flange cover plate form, in order to satisfy all kinds of engineering and user requirements. Widely used in petroleum, chemical industry, hydropower and thermal power plants in the pipeline of multiple system.

1。 Fluid resistance small, sealing surface is medium erosion and erosion.

2。 Easier to open and close. Open and close the required torque is small. 3. Can be used for two-way flow of medium ring pipe, the flow direction of medium is not restricted. 4. Shorter body, simple structure, good manufacturing process, wide application scope. When sealing surface fully open, working medium for valve sealing surface erosion is smaller than 5. The length of the structure is relatively short. Nominal pressure or stress levels: PN1. 0 - 16. 0PANSI- 15300LB( JIS10- 20K) The nominal path or caliber: DN10 - 1000 - NPS 1 - 2 - 36 'drive mode: manual, bevel gear transmission, pneumatic, electric, water, power, gas and liquid, electro-hydraulic linkage: body material WCB, ZG1Cr18Ni9Ti, ZG1Cr18Ni12Mo2Ti, CF8, 304). ，CF3( 304 L) ，CF8M( 316 L) ，CF3M( 316 L) ，Ti。 Different materials can be used for water, steam, oil, nitric acid, acetic acid, oxidizing medium, medium such as urea. Because the gate valve has many advantages, and therefore has been widely used. In the DN of 50 mm for cutting medium or pipeline, gate, usually used even in DN 15 ~ 40 mm small-bore pipeline, such as currently there are still part of the gate is retained. A gate structure form is varied, the main difference lies in the structure of the sealing element is different. According to the structure of the sealing element, the gate is usually divided into several different types, the most common form is flat gate and wedge gate valves. According to the structure of stem, also can be divided into lifting lever ( Sanctioned) And rotating pole ( Non-rising stem) Gate valves. Belong to the slide valve gate valve. It is mainly used for the line cutting medium, that is, not separation or fully closed. In general, it cannot be used as a choke. Gate valves can be used in high temperature and high pressure, can also be used for a variety of different media, but generally does not apply to transport mud and viscous fluid pipeline. Gate valves are used for the shape and size of the valve is not strict, and using the double harsh conditions, such as high temperature and high pressure working medium, the closed parts are needed to ensure long-term sealing, etc. Gate valve's main advantage is when the valve is fully open, the pipeline can be a straight line through the media, therefore the valve through the fluid resistance is small. In addition, in the case of small installation space, suitable for large diameter valves and pipe installation of limited space, such as underground pipeline, applicable Yu Zaikai closed without changing the height of the non-rising stem gate valve selection. However, the valve must be equipped with an opening and closing indicator, to show the valve open. The non-rising stem gate valve stem threads are the shortcomings of direct contact with the media, easy to corrosion medium, at the same time, not easy and smooth, easy to damage. Gate, there is also a structure in the valve body channel diameter, valve seat sealing surface of a smaller diameter and the diameter of flange connection, called contraction gate valves. The gate structure, small volume, light weight, but big flow resistance, suitable for pipe flow resistance is not high, in steam, water pipes have more choices. Due to its path contraction, reduced the size of the parts, and accordingly reduces the opening and closing the required torque. However, deflation and contraction, fluid resistance loss increases. In order to minimize the medium by the mouth of contraction of fluid resistance loss, can use guide ring. A gate valve in the pipeline of oil system does not allow contraction. In the petrochemical system, especially in the oil and gas transmission pipeline, choosing the float valve seat plate gate valve is more appropriate. This kind of gate valves can be divided into two types with diversion hole and diversion hole. The slab gate valve with flow guide hole is mainly used in oil and gas pipeline cleaning, especially for large, high parameter and high automation requirements pipeline. Without diversion hole plate gate valves are suitable for all kinds of pipe opening and closing device. In all valves open and close the slowest is gate valves. In the process of opening and closing, the moving distance of the gate is greater than the channel diameter of the valve, gate valve, the total height is higher, larger space position, the volume is bigger. From the mechanical point of view, however, it has a larger degree of freedom, is suitable for water conservancy facilities.

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