Basic Info.
Surface Treatment
Oil Blooming
Transport Package
Wooden Case
Specification
medium-sized
Product Description
How it works edit
The gate valve's opening and closing parts are the gate. The movement direction of the gate is perpendicular to the fluid direction. The gate valve can only be fully opened and fully closed, and cannot be adjusted and throttled. The ram has two sealing surfaces, the most commonly used mode is that the two sealing surfaces of the ram valve form wedges, and the wedge angle varies with the valve parameters, usually 5 ° and 2 ° 52 'when the medium temperature is not high. The ram of wedge gate valve can be made into a whole, which is called rigid ram; it can also be made into a ram that can produce slight deformation, so as to improve its processability and make up for the deviation of sealing surface angle in the process of processing. This kind of ram is called elastic ram. When the gate valve is closed, the sealing surface can only be sealed by the medium pressure, that is, the sealing surface of the gate valve is pressed to the seat on the other side by the medium pressure to ensure the sealing of the sealing surface, which is self sealing. Most gate valves adopt forced sealing, that is, when the valve is closed, the gate shall be forced against the valve seat by external force to ensure the sealing of the sealing surface. The gate valve of the gate valve moves in a straight line with the stem, which is called rising stem gate valve or rising stem gate valve. Generally, there is trapezoid thread on the lifting rod. Through the nut at the top of the valve and the guide groove on the valve body, the rotating motion is changed into linear motion, that is, the operating torque is changed into the operating thrust. When opening the valve, when the lifting height of the ram is equal to 1:1 times of the valve diameter, the flow passage is completely unblocked, but this position cannot be monitored during operation. In actual use, the vertex of the valve rod is taken as the mark, that is, the position that can not be opened is taken as its full open position. In order to consider the phenomenon of locking due to the change of temperature, the valve is usually opened to the vertex position, and then turned back 1 / 2-1 circle as the position of fully open valve. Therefore, the full open position of the valve is determined according to the position of the ram, i.e. the stroke. Some gate valves, the stem nut is set on the gate, and the hand wheel rotates to drive the stem to rotate, so as to lift the gate. This kind of valve is called rotary stem gate valve, or concealed stem gate valve.
Motion editing
When the gate valve is closed, the sealing surface can be sealed only by the medium pressure, that is, only by the medium
Z41h flange wedge gate valve
Z41h flange wedge gate valve
The pressure presses the sealing surface of the ram to the valve seat on the other side to ensure the sealing of the sealing surface, which is self sealing. Most gate valves adopt forced sealing, that is, when the valve is closed, the gate shall be forced against the valve seat by external force to ensure the sealing of the sealing surface.
Movement mode: the gate valve of the gate valve moves in a straight line with the stem, also known as the rising stem gate valve. Generally, there is trapezoid thread on the lifting rod. Through the nut at the top of the valve and the guide groove on the valve body, the rotating motion is changed into linear motion, that is, the operating torque is changed into the operating thrust. When opening the valve, when the lifting height of the ram is equal to 1:1 times of the valve diameter, the flow passage is completely unblocked, but this position cannot be monitored during operation. In actual use, the vertex of the valve rod is taken as the mark, that is, the position that can not be opened is taken as its full open position. In order to consider the phenomenon of locking due to the change of temperature, the valve is usually opened to the vertex position, and then turned back 1 / 2-1 circle as the position of fully open valve. Therefore, the full open position of the valve is determined by the position of the RAM (i.e. stroke). Some gate valve stem nuts are set on the gate, and the hand wheel rotates to drive the stem to rotate, so as to lift the gate. This kind of valve is called rotary stem gate valve or concealed stem gate valve.
Gate valve type edit
There are many manufacturers of gate valve in China
Rigid single gate valve
Rigid single gate valve
Most of the joint sizes are not uniform. It is mainly divided into the following categories: 1. Standard valve of mechanical department produced according to structural length of gate valve (JB / t2203-1999); 2. National standard valve produced according to structural length of metal valve (GB / t12221-2005); 3. American Standard valve produced according to face to face and end to end dimensions of valve (ASME b16.10-2009).
Gate valves are divided into wedge type and parallel type according to the structure of the gate. Wedge ram has three structures: single ram, double ram and elastic ram.
According to different structure types, gate valves are divided into flat gate valves and knife gate valves.
Working principle of manual gate valve: turn the hand wheel to lift or lower the valve plate connected with the valve rod through the screw advance and retreat of the hand wheel and the valve rod, so as to achieve the function of opening and closing.
According to the classification of shell / body materials, gate valves can be divided into:
Metal material valve: such as carbon steel valve, alloy steel valve, stainless steel valve, cast iron valve, titanium alloy valve, Monel valve, copper alloy valve, lead alloy valve, etc.
Metal body lined valve: such as rubber lined valve, fluorine lined valve, lead lined valve, plastic lined valve, enamel lined valve.
Non metallic material valve: such as ceramic valve, glass valve, plastic valve.
Advantages and disadvantages editing
advantage
1. The flow resistance is small. The medium channel inside the valve body is straight, the medium flows in a straight line, and the flow resistance is small.
2. It is easier to open and close. Compared with the stop valve, the movement direction of the ram is perpendicular to the flow direction of the medium whether it is open or closed.
3. High height, long opening and closing time. The opening and closing stroke of ram is large, and the lifting is carried out by screw.
4. Water hammer is not easy to occur. The reason is that it was closed for a long time.
5. The medium can flow in any direction on both sides, which is easy to install. Both sides of gate valve channel are symmetrical.
6. The length of the structure (the distance between the two connecting ends of the system housing) is small.
7. The utility model has the advantages of simple shape, short structure length, good manufacturing technology and wide application range.
8. Compact structure, good rigidity of valve, smooth channel, small flow resistance, stainless steel and hard alloy sealing surface, long service life, and use of PTF
Address:
Zhenbei Road 3199 Lane Nebula Economic Zone, Shanghai, China
Business Type:
Manufacturer/Factory
Business Range:
Industrial Equipment & Components, Instruments & Meters, Manufacturing & Processing Machinery, Tools & Hardware
Management System Certification:
ISO 9001
Company Introduction:
Shanghai Jingcheng Valve Manufacturing Co., Ltd is a modern professional marine valve manufacturer integrating research, development, production and sales. It is a member of China Valve Association, PetroChina First-Class Supply Network, China Shipbuilding Industry Joint Venture, China Marine Machinery Standardization Technical Committee and the National Marine Valve Standardization Technical Committee.
The company has strong technical force, rich design experience, sophisticated production equipment, advanced production technology, complete testing means, strict system operation, strict management breeds high-quality and reliable products. The company′s products are manufactured with national standard GB, ministerial standard CB, JB, Japanese standard JIS, American standard API, German standard DIN, foreign trade standard CBM and other technical conditions and drawings. Now the varieties have reached more than 200 series and more than 2000 specifications. The main products are various specifications of marine butterfly valves, marine gate valves, marine globe valves, marine ball valves, marine needle valves, marine regulating valves, marine throttle valves, marine plunger valves, marine check valves, marine safety valves, marine pressure relief valves, marine self-closing valves, marine fast closing valves, marine Globe Check valves, marine dragon valves, etc. Marine plug valves, marine mud tanks, marine open-sea valves, marine seawater filters, marine oil filters, marine wave-proof valves, marine air caps, marine bathymetric self-closing valves, marine water control valves, marine valves, marine high temperature and high pressure power station valves. The material of valve body is carbon steel, cast iron, stainless steel, bronze, brass, forged steel, alloy steel, etc. The sealing surface materials are copper alloy, carburized steel, cemented carbide, rubber plastic, PTFE soft and hard seals, which can meet the needs of different media. Products are widely used in petrochemical, shipbuilding, nuclear power, chemical industry, medicine, metallurgy, power, food, environmental protection construction and other fields.