The opening and closing part of the GB gate valve is a gate plate. The movement direction of the gate plate is perpendicular to the direction of the fluid. The gate valve can only be fully opened and fully closed and cannot be adjusted or throttled. The gate valve is a kind of valve with a wide range of use. Generally, the cutting device with DN≥50mm has selected it. Sometimes the cutting device with a small diameter also uses a gate valve with two sealing surfaces. The two most commonly used mode gate valves The sealing surfaces are wedge-shaped and the wedge angle varies with the valve parameters, typically 50, and 2° 52′ when the medium temperature is not high. Wedge gate valve gate can be made into a whole, called the rigid gate; can also be made to produce a slight deformation of the gate, in order to improve its craft, to make up for the deviation of the sealing surface angle in the process, this gate The board is called a flexible shutter. The gate valve is the main control device for the flow rate or delivery volume of powder, crystal grain, granular material and small piece of material. It is widely used in metallurgy, mining, building materials, food, chemical industries to control flow changes or cut off quickly.
GB gate valve specifically refers to the type of cast steel gate valve, according to the sealing surface configuration can be divided into wedge gate valve and parallel gate valve, wedge gate valve can be divided into: single gate type, double gate plate type and elasticity Gate type; Parallel gate valve can be divided into single gate type and double gate type. Divided according to the thread position of the valve stem, it can be divided into two kinds: open rod gate valve and dark rod gate valve.
When the GB gate valve is closed, the sealing surface can be sealed only by medium pressure, that is, relying on the medium pressure to press the sealing surface of the gate plate to the valve seat on the other side to ensure the sealing of the sealing surface, which is self-sealing. Most of the gate valves are forced to seal, that is, when the valve is closed, it is necessary to force the gate plate to press against the valve seat in order to ensure the sealing performance of the sealing surface.
The gate of the GB gate valve makes linear motion with the valve stem and is called lift rod gate valve (also called open rod gate valve). Trapezoidal threads are usually provided on the lifting rods. The nut on the top of the valve and the guide groove on the valve body convert the rotation into a linear motion, that is, the operating torque becomes the operating thrust.
When the valve is opened, when the lift height of the gate is equal to 1:1 of the valve diameter, the fluid channel is completely open, but this position cannot be monitored during operation. In actual use, the vertex of the valve stem is used as a mark, that is, a position that does not move, as its fully open position. To account for temperature changes in the lock-up phenomenon, usually in the open to the top position, and then back 1/2 -1 turn, as a fully open valve position. Therefore, the fully open position of the valve is determined by the position of the gate (ie stroke).
advantage
1, the fluid resistance is small, the sealing surface is affected by the medium brush and erosion.
2, open and close more effort.
3, the direction of flow of the media is not limited, does not disturb the flow, does not reduce the pressure.
4, simple body, short structure, good manufacturing process, a wide range of applications.
Shortcomings
1. It is easy to cause erosion and scratches between the sealing surfaces and maintenance is difficult.
2. Large size, opening requires a certain space, long opening and closing time.
3, the structure is more complicated.
For a long time, the general gate valve used in the market generally suffers from water leakage or rust. Zhengzhou Dingsheng introduced the European high-tech rubber and valve manufacturing technology to produce the elastic seat sealing gate valve, which overcomes the defects of general gate valve sealing and rust, etc. The gate valve utilizes the compensation effect of the elastic gate to generate a slight amount of elastic deformation to achieve a good sealing effect. The valve has the advantages of lightness of the switch, reliable sealing, good elastic memory, and long service life. Can be widely used in tap water, sewage, construction, petroleum, chemical, food, medicine, textile, electric power, shipbuilding, metallurgy, energy systems and other body pipelines used as regulation and closure devices. Installation and use 1. Before installation, check the valve cavity and the sealing surface, etc., and do not allow any dirt or sand particles to adhere; 2. Bolts at each connection site require uniform tightening; 3. Check the packing site requirements for tightness and ensure the packing. Sealing, but also to ensure that the gate open and flexible; 4 users must verify the valve model before the installation of the valve, the connection size and pay attention to the flow of media, to ensure consistency with the valve requirements; 5. The user must install the valve, you must set aside The necessary space for the valve drive; 6. The wiring of the drive device must be carried out according to the circuit diagram; 7. The valve must be maintained regularly, and it must not be crushed and squeezed freely to avoid affecting the seal.
The installation and maintenance of the national gate valve should pay attention to the following matters:
Handwheels, handles, and transmissions are not allowed to lift, and collisions are strictly prohibited.
The double gate valve should be installed vertically (ie, the stem is in a vertical position with the handwheel at the top).
Valves with bypass valves should open the bypass valve before opening (to balance the pressure difference between inlet and outlet).
The gate valve with transmission mechanism shall be installed in accordance with the instructions of the product manual.
If the valve is always switched on and on, lubricate it at least once a month.
Main technical and design parameters test pressure (MPa)
Nominal pressure (MPa)
Pressure class (Class)
JIS(MPa)
1.6
2.5
4.0
6.4
10.0
Working temperature PTFE≤150°CPPL≤300°C Carbon fiber ≤350°C
Applicable medium C: water, oil, steam P: nitric acid (temperature ≤ 200 °C) R: acetic acid (temperature ≤ 200 °C)
Design Parameters:
Design, manufacture: GB/T12237-89
Flange connection: JB/T79-94, GB9113-2000
Structure length: GB12221-89
Nominal diameter: DN15~DN150mm
Nominal pressure: PN1.6, 2.5, 4.0MP.
The national standard gate valve implementation standard length GB12221-89
Flange size GB9113-2000JB79-94
Pressure-temperature GB9131
Design/Manufacture GB12237-94
Test - Inspection GB/T13927HB/T9092
GB valve pressure test (Mpa):
Nominal pressure 1.62.546.41016
Strength test 2.43.869.61524
Water seal test 1.82.84.471118
On the seal test 1.82.84.47.041118
Hermetic test 0.4-0.
GB gate valve specifically refers to the type of cast steel gate valve, according to the sealing surface configuration can be divided into wedge gate valve and parallel gate valve, wedge gate valve can be divided into: single gate type, double gate plate type and elasticity Gate type; Parallel gate valve can be divided into single gate type and double gate type. Divided according to the thread position of the valve stem, it can be divided into two kinds: open rod gate valve and dark rod gate valve.
When the GB gate valve is closed, the sealing surface can be sealed only by medium pressure, that is, relying on the medium pressure to press the sealing surface of the gate plate to the valve seat on the other side to ensure the sealing of the sealing surface, which is self-sealing. Most of the gate valves are forced to seal, that is, when the valve is closed, it is necessary to force the gate plate to press against the valve seat in order to ensure the sealing performance of the sealing surface.
The gate of the GB gate valve makes linear motion with the valve stem and is called lift rod gate valve (also called open rod gate valve). Trapezoidal threads are usually provided on the lifting rods. The nut on the top of the valve and the guide groove on the valve body convert the rotation into a linear motion, that is, the operating torque becomes the operating thrust.
When the valve is opened, when the lift height of the gate is equal to 1:1 of the valve diameter, the fluid channel is completely open, but this position cannot be monitored during operation. In actual use, the vertex of the valve stem is used as a mark, that is, a position that does not move, as its fully open position. To account for temperature changes in the lock-up phenomenon, usually in the open to the top position, and then back 1/2 -1 turn, as a fully open valve position. Therefore, the fully open position of the valve is determined by the position of the gate (ie stroke).
advantage
1, the fluid resistance is small, the sealing surface is affected by the medium brush and erosion.
2, open and close more effort.
3, the direction of flow of the media is not limited, does not disturb the flow, does not reduce the pressure.
4, simple body, short structure, good manufacturing process, a wide range of applications.
Shortcomings
1. It is easy to cause erosion and scratches between the sealing surfaces and maintenance is difficult.
2. Large size, opening requires a certain space, long opening and closing time.
3, the structure is more complicated.
For a long time, the general gate valve used in the market generally suffers from water leakage or rust. Zhengzhou Dingsheng introduced the European high-tech rubber and valve manufacturing technology to produce the elastic seat sealing gate valve, which overcomes the defects of general gate valve sealing and rust, etc. The gate valve utilizes the compensation effect of the elastic gate to generate a slight amount of elastic deformation to achieve a good sealing effect. The valve has the advantages of lightness of the switch, reliable sealing, good elastic memory, and long service life. Can be widely used in tap water, sewage, construction, petroleum, chemical, food, medicine, textile, electric power, shipbuilding, metallurgy, energy systems and other body pipelines used as regulation and closure devices. Installation and use 1. Before installation, check the valve cavity and the sealing surface, etc., and do not allow any dirt or sand particles to adhere; 2. Bolts at each connection site require uniform tightening; 3. Check the packing site requirements for tightness and ensure the packing. Sealing, but also to ensure that the gate open and flexible; 4 users must verify the valve model before the installation of the valve, the connection size and pay attention to the flow of media, to ensure consistency with the valve requirements; 5. The user must install the valve, you must set aside The necessary space for the valve drive; 6. The wiring of the drive device must be carried out according to the circuit diagram; 7. The valve must be maintained regularly, and it must not be crushed and squeezed freely to avoid affecting the seal.
The installation and maintenance of the national gate valve should pay attention to the following matters:
Handwheels, handles, and transmissions are not allowed to lift, and collisions are strictly prohibited.
The double gate valve should be installed vertically (ie, the stem is in a vertical position with the handwheel at the top).
Valves with bypass valves should open the bypass valve before opening (to balance the pressure difference between inlet and outlet).
The gate valve with transmission mechanism shall be installed in accordance with the instructions of the product manual.
If the valve is always switched on and on, lubricate it at least once a month.
Main technical and design parameters test pressure (MPa)
Nominal pressure (MPa)
Pressure class (Class)
JIS(MPa)
1.6
2.5
4.0
6.4
10.0
Working temperature PTFE≤150°CPPL≤300°C Carbon fiber ≤350°C
Applicable medium C: water, oil, steam P: nitric acid (temperature ≤ 200 °C) R: acetic acid (temperature ≤ 200 °C)
Design Parameters:
Design, manufacture: GB/T12237-89
Flange connection: JB/T79-94, GB9113-2000
Structure length: GB12221-89
Nominal diameter: DN15~DN150mm
Nominal pressure: PN1.6, 2.5, 4.0MP.
The national standard gate valve implementation standard length GB12221-89
Flange size GB9113-2000JB79-94
Pressure-temperature GB9131
Design/Manufacture GB12237-94
Test - Inspection GB/T13927HB/T9092
GB valve pressure test (Mpa):
Nominal pressure 1.62.546.41016
Strength test 2.43.869.61524
Water seal test 1.82.84.471118
On the seal test 1.82.84.47.041118
Hermetic test 0.4-0.
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