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Elastic seated gate valve


Elastic seated gate valve
Stable quality: implement quality monitoring throughout the process, meticulous and comprehensive detection!

Reasonable price: efficient internal cost control, reducing expenses and benefiting customers!

Fast delivery: advanced production lines, sufficient stocking, shortening the delivery time!
Sales: 021-31007323
Fax: 021-333321522
Technology: 021-31007323

product manual Pledge Order process

 

  Product name : Elastic seated gate valve Product model : Z45, RVCX, RVCH
   Driving method : Manual Connection form : Flange
   Structure form : Concealed Elasticity    Sealing material : Nitrile rubber
   Pressure range : 1.6 ~ 6.4MPa    Nominal diameter : DN50-DN600
   Common materials : Ductile iron, cast steel, stainless steel, 316L    Technical consultation : 021-31007323

是国内著名〖 弹性座封闸阀 〗制造商,也是国内大型【 】生产商之一,公司自成立以来始终围绕客户的需求并持续创新,为广大的代理商和企业客户提供〖弹性座封闸阀 〗解决方案,质量可靠,价格实惠,故畅销全国各地,欢迎新老客户来电,来函,我们将为您提供最优质的服务。 Hushan Valve Manufacturing (Shanghai) Co., Ltd. is a well-known domestic manufacturer of " elastic seated gate valves" and one of the largest domestic [ gate valve ] manufacturers. Since its establishment, the company has always focused on customer needs and continued innovation as a broad agent. Business and enterprise customers provide the "Elastic Seat Gate Valve" solution, which is reliable in quality and affordable, so it sells all over the country. Welcome new and old customers to call us or write us, we will provide you with the best service.

I. Brief introduction of elastic seated gate valve:
  
The gate has two sealing surfaces. The two sealing surfaces of the most commonly used mode gate valves form a wedge shape. The wedge angle varies with the valve parameters, usually 50, and 2 52 '' when the medium temperature is not high. The gate of the wedge gate valve can be made into a whole, called a rigid gate; it can also be made into a gate that can produce a small amount of deformation to improve its processability and make up for the deviation of the sealing surface angle during processing. The plate is called a spring gate.

The elastic seated gate valve is also called a lift rod gate valve (also known as an open rod gate valve). 软密封闸阀 通过阀门顶端的螺母以及阀体上的导槽,将旋转运动变为直线运动,也就是将操作转矩变为操作推力。 Usually there is trapezoidal thread on the lifting rod. The soft-sealed gate valve changes the rotary motion into linear motion through the nut on the top of the valve and the guide groove on the valve body, that is, the operating torque is changed to 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 clear, but this position cannot be monitored during operation. In actual use, the apex of the valve stem is used as a mark, that is, the position where it cannot be opened, as its fully open position. In order to consider the lock-up phenomenon caused by temperature changes, it is usually opened to the top position, and then back to 1 / 2-1 turn as the position of the fully open valve. Therefore, the fully open position of the valve is determined by the position of the shutter (ie, the stroke).


Second, the requirements of the elastic seat gate valve:
 

1.1 The specifications and types of elastic seated gate valves shall meet the requirements of the pipeline design documents.

1.2 The type of elastic seated gate valve should indicate the national standard number requirements. If it is an enterprise standard, the relevant description of the model should be indicated.

1.3 The working pressure of the elastic seated gate valve is required to be ≥ the working pressure of the pipeline. Without affecting the price, the working pressure that the valve can withstand should be greater than the actual working pressure of the pipeline. Withstand 1.1 times the valve's working pressure without leakage; when the valve is open, the valve body should be able to withstand double the valve's working pressure.

1.4 The manufacturing standard of elastic seated gate valve shall indicate the national standard number on which it is based. If it is an enterprise standard, the enterprise contract shall be attached to the procurement contract. This type of valve should generally be installed horizontally in the pipeline.


Third, the elastic seat seal gate valve standard:
 

2.1 The material of the valve body should be nodular cast iron, cast steel, stainless steel, 316L, and indicate the grade and actual physical and chemical test data of cast iron.

2.2 Valve stem material, striving for stainless steel stem (2CR13), large-caliber valve should also be stainless steel inlaid stem.

2.3 Nut material, using cast aluminum brass or cast aluminum bronze, and the hardness and strength are greater than the valve stem.

2.4 Stem bushing material, its hardness and strength should not be greater than the stem, and no electrochemical corrosion with the stem and valve body under water immersion.

2.5 Material of sealing surface

① Different types of elastic seated gate valves, different sealing methods and material requirements;

② For ordinary wedge gate valves, the material, fixing method and grinding method of the copper ring should be specified;

③Physical, chemical and hygienic test data of elastic seated gate valve and valve lining rubber material;

2.6 Valve shaft packing

① Due to the elastic seated gate valve in the pipe network, it is usually opened and closed infrequently. It is required that the packing does not move for several years, the packing does not age, and the sealing effect is maintained for a long time;

② Valve shaft packing should also have good sealing effect when subjected to frequent opening and closing;

③ In view of the above requirements, the valve shaft packing strives not to change for a lifetime or for more than ten years;

④ If the packing needs to be replaced, the design of the pneumatic valve should consider the measures to be replaced under the condition of water pressure.

弹性座封闸阀操作机构: Fourth, the elastic seat seal gate valve operating mechanism:
 

3.1 The opening and closing direction of the elastic seat gate valve should be closed clockwise.

3.2 Due to the pneumatic valve in the pipe network, it is often manually opened and closed, and the number of opening and closing revolutions should not be too much, that is, the large-caliber valve should also be within 200-600 revolutions.

3.3 In order to facilitate the opening and closing operation of one person, the maximum opening and closing torque should be 240N-m under the condition of pipeline pressure.

3.4 The opening and closing operation end of the elastic seat sealing gate valve should be square tenon, and its size is standardized and facing the ground, so that people can directly operate from the ground. Valves with roulette are not suitable for underground pipe networks.

3.5 Display panel for opening and closing degree of elastic seat gate valve

① The scale of the opening and closing degree of the elastic seat gate valve should be cast on the gearbox cover or the housing of the display panel after the direction is changed, all facing the ground.

② The material of the indicator needle can be made of stainless steel under better management; otherwise, it is painted steel, and it should not be made of aluminum skin;

③ The indication needle is eye-catching and firmly fixed. Once the opening and closing adjustment is accurate, it should be locked with rivets.

3.6 If the flexible seat sealing gate valve is buried deeper, when the distance between the operating mechanism and the display panel is 1.5m from the ground, an extension rod facility shall be provided and fixed firmly so that people can observe and operate from the ground. In other words, the opening and closing of valves in the pipeline network is not suitable for downhole operations.

弹性座封闸阀用途及特点: Fifth, the use and characteristics of elastic seated gate valve:
 

Elastic seated gate valve

Elastic seated gate valve is widely used as a regulating and shut-off device on fluid pipelines such as tap water, sewage, construction, petroleum, chemicals, food, medicine, textiles, electricity, ships, metallurgy, and energy systems.

Features of elastic seated gate valve

1.Flat bottom valve seat, no dirt accumulation, making the seal more reliable

2. The valve flap is entirely covered with nitrile rubber, and the valve internals are made of corrosion-resistant and non-rusting steel and copper alloy materials, which can be used in sewage systems to adapt to harsh working environments.

3. Small size and light weight, easy to install and maintain

4. The valve stem adopts three O-ring seals, which greatly reduces the friction resistance when switching, and the switch is light and does not leak.

弹性座封闸阀的优势: Six, the advantages of elastic seated gate valve:
 

When the elastic seat sealing gate valve is closed, the sealing surface can be sealed only by the medium pressure, that is, the sealing surface of the gate is pressed against the valve seat on the other side only to ensure the sealing of the sealing surface, which is self-sealing. Most gate valves are forcedly sealed, that is, when the gate valve is closed, the gate is forced to be pressed against the valve seat by external force to ensure the tightness of the sealing surface.

When the gate valve is opened, when the gate lift height is equal to 1: 1 of the gate valve diameter, the fluid channel is completely clear, but this position cannot be monitored during operation. In actual use, the apex of the valve stem is used as a mark, that is, the position where it cannot be opened, as its fully open position. In order to consider the lock-up phenomenon caused by temperature change, it is usually opened to the top position, and then back to 1 / 2-1 turn as the position of the full open valve. Therefore, the fully open position of the gate valve is determined according to the position of the gate (i.e., the stroke). The sealing surface is easy to wear and affects the service life. When opening and closing, the two sealing surfaces of the gate and the valve seat frictionally slide against each other. It is easy to produce abrasion and wear, which affects the sealing performance and shortens the service life.

For a long time, the general gate valve used on the market has generally suffered from water leakage or rust, which overcomes the defects such as poor sealing and rust of the general gate valve. The elastic seat sealing gate valve uses the elastic gate plate to generate a small amount of elastic deformation compensation to achieve a good sealing effect. It has obvious advantages such as light switch, reliable seal, good elastic memory and long service life. Can be widely used in water, sewage, construction, petroleum, chemical, food, medicine, textile, power, marine, metallurgy, energy systems and other body pipelines as regulating and shut-off devices. This is the advantage and advantage of the elastic seated gate valve.

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