What is the parallel double gate valve used for?

It is used in petroleum, chemical industry, natural gas, etc.

Here are some of the well-known brands recognized in the valve industry, which are widely recognized and have a high reputation. While rankings may vary depending on time and market conditions, the following brands are generally considered to be among the top brands in the valve industry:

The following influential first-line brands of water system valves and industrial valves can be used as a reference, but for reference only: Suzhou Neway Valve, Shanghai Guanlong Valve, Shanghai Qizhong Valve, Sanhua, Su Yan, Shentong, Su Valve, Nanfang, Jiang.

First, the word Yao. The above manufacturers are only estimates and references, and the specific situation may vary or fluctuate at any time due to changes in a series of factors such as changes in the market, the size of the competition pattern, and the stability of product quality. As an indispensable key device in industrial production and civil facilities, the quality and reputation of the valve brand directly affect the satisfaction and trust of users.

These brands are known in the valve industry for their innovative technology, high-quality products and reliability. It is important to note that the market and industry are evolving rapidly, and different rankings may vary depending on time and region. For the most up-to-date ranking information, it is recommended to refer to industry reports, professional organizations or market research data for more detailed and accurate information.

Globe valves and gate valves in the structure.

This article begins with a look at what.

It is a parallel gate valve.

That is, the sealing surface is parallel to the vertical centerline, so the sealing surface on the valve body and the ram is also parallel to each other. The most common type of gate valve is double gate type, in order to make the valve body and the gate two sealing surfaces contact tightly, often use the double-sided thrust wedge clamped between the two rams. In this way, when the valve is closed, the double-sided thrust secondary block is in contact with the bottom of the valve body and is gradually stressed, and the double ram is pushed open so that the sealing surface of the ram is sealed and close to the valve body.

This kind of double ram parallel gate is mostly used on low-pressure pipelines such as small pipelines. Parallel gate valves also use a single gate, but it is rare.

That is, the sealing surface is at a certain angle to the vertical centerline, and the higher the temperature of the medium, the greater the tilt angle, so as to reduce the possibility of wedge when the temperature changes.

The gate of the wedge gate valve is both single and double. The advantages of the double ram type are that the accuracy of the sealing and angle is low, the temperature change is not easy to wedge the ram, and the gasket can be compensated for the wear of the sealing surface.

The disadvantage is that the structure is complex, easy to stick in dry media, and more importantly, the upper and lower baffles are easy to fall off after being corroded for many years. Although the single ram has the shortcomings such as high accuracy requirements of sealing and angle, difficult processing and temperature change may make the ram wedged, the structure is simple, the use is reliable, especially after changing to the elastic ram, it can produce the slight most elastic deformation to make up for the deviation generated in the processing of the angle of the sealing surface, so it is widely used at present.

Flat gate valves are suitable for natural gas, petroleum, chemical, environmental protection, urban pipelines, gas pipelines and other transmission pipelines, venting systems and steam storage devices, and are used as opening and closing equipment. Z43 single-gate plate gate valve with diversion orifice is suitable for long-distance pipelines for natural gas extraction and purification.

Plate Gate Valve Bore Range: DN25 1200 Pressure Range: 150lb 3000lb

Flat gate valves with deflector orifice are used for pipelines that require ball pigging, and non-deflector holes are used for pipelines that do not require ball pigging.

According to the driving mode, flat gate valves can be divided into manual flat gate valves, pneumatic flat gate valves and electric flat gate valves. According to the use and use occasions, it can be divided into flat gate valve with diversion hole, flat gate valve without diversion hole, oilfield Douwei flat gate valve, pipe air Yingpei line flat gate valve and gas flat gate valve.

Forged steel gate valve is suitable for class150 2500, working temperature -29 425 (carbon steel) or -29 500 (stainless steel) on small diameter pipelines, used to cut off or connect the medium in the pipeline, choose different materials, can be suitable for water, steam, oil, nitric acid, acetic acid, oxidizing medium, urea and other media 1), the installation location, height, inlet and outlet direction must meet the design requirements, the connection should be firm and tight.

2) All kinds of manual valves installed on the insulation pipeline, the handle shall not be downward.

3) The visual inspection must be carried out before the valve is installed, and the nameplate of the valve should comply with the provisions of the current national standard "General Valve Mark" GB 12220. For valves with working pressure greater than MPA and shut-off on the main pipe, strength and tightness performance tests should be carried out before installation, and they should be used only after they are qualified. During the strength test, the test pressure is times of the nominal pressure, the duration is not less than 5min, and the valve housing and packing should be qualified without leakage.

During the tightness test, the test pressure is multiple of the nominal pressure; The test pressure should meet the requirements of GB 50243 standard for the duration of the test, and the sealing surface of the valve disc should be qualified if there is no leakage.

The gate valve is one of the most commonly used shut-off valves, which is mainly used to connect or cut off the medium in the pipeline, and is not used to regulate the flow rate of the medium. The pressure, temperature and diameter range used are very large, especially for medium and large diameter pipes.