What does a dark rod buried gate valve look like?

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.

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Working principle of dark rod gate valve:When the valve stem is rotated, under the action of the nut at the top of the valve and the guide groove on the valve body, the valve stem will move up and down in a straight line, and the valve stem has the drive to move the gate at the same time. The direction of movement of the ram is perpendicular to the direction of the flow of the medium in the pipe.

Because the stem thread is inside the valve body, the opening and closing state of the valve cannot be judged by observing the position of the valve stem during the opening process of the dark stem gate valve like the open rod gate valve. Under normal circumstances, the opening and closing state of the dark rod gate valve is until the valve stem cannot be rotated, but considering that there will be special conditions, the valve is locked, in order to ensure the production safety of the pipeline, the dark rod gate valve is generally opened to the valve stem after not moving, and then rotate 1 2 times.

The overall height of the dark rod gate valve will not change during the working process, so the dark rod gate valve occupies less space during installation, and is more suitable for installation in indoor and other environments with limited space.

The working principle and method of the dark rod gate valve:

1. Gate valve is one of the more commonly used shut-off valves, which is mainly used to connect or cut off the medium in the pipeline; Gate valves are suitable for a wide range of pressure, temperature and diameter, especially for medium and large diameter pipelines.

2. The wedge-type rigid single ram has simple structure, small size, and is more reliable to use, and it is suitable for various media and pressure environments at room temperature and medium temperature. It is widely used in water supply and drainage, gas, electric power, metallurgy, petroleum, chemical industry, textile and urban construction industries, and is used for opening and closing pipelines of steam, water and oil media.

3. Low fluid resistance. The medium channel inside the gate valve body is straight, and the medium does not change its flow direction when it flows through the gate valve, so the flow resistance is small.

4. Opening and closing is more labor-saving. When opening and closing, the direction of movement of the ram is perpendicular to the direction of medium flow. Compared with the globe valve, the opening and closing of the gate valve is more labor-saving.

5. The flow direction of the medium is generally not restricted. The medium can flow in any direction on both sides of the gate valve, and the purpose of connecting or cutting off can be achieved. Easy to install and suitable for use in pipelines where the flow direction of the medium may change.

The opening and closing parts of the dark rod gate valve are the ram, the direction of movement of the ram is perpendicular to the direction of the fluid, and the gate valve can only be fully opened and closed, and cannot be adjusted and throttled. The ram has two sealing surfaces, and the most commonly used mode gate valve has two sealing surfaces forming a wedge, and the wedge angle varies with the valve parameters, usually 50, and 2°52 when the medium temperature is not high. The gate plate of the wedge gate valve can be made into a whole, which is called a rigid gate; It can also be made into a ram that can produce a slight amount of deformation to improve its manufacturability and make up for the deviation of the sealing surface angle in the processing process, which is called an elastic ram.

Dark rod gate valve is also called rotary rod gate valve (also known as dark rod wedge gate valve). The stem nut is located on the ram, and the handwheel rotates to drive the valve stem to rotate, and the ram is lifted, usually there is a trapezoidal thread at the bottom end of the valve stem, and the thread at the bottom of the valve and the guide groove on the valve disc are passed.

There are several major differences between the open rod gate valve and the dark rod gate valve: 1. The open rod gate valve can see the screw rod, but the dark rod can not see the lead screw; 2. The open rod gate valve is used to lift or lower the valve disc through the threaded transmission between the valve stem and the steering wheel; When the dark rod gate valve is switched, the steering wheel and the valve stem are connected together and relatively immovable, and it is driven by the valve stem to rotate at the fixed point to drive the valve disc to lift up and down to complete the opening and closing; 3. The transmission thread of the dark rod gate valve is located inside the valve body, and in the process of opening and closing, the valve stem only rotates, and the gate plate rises and falls in the valve body; The valve stem of the open rod gate valve drives the gate plate to rise and fall together, and the transmission thread on the valve stem is outside the valve body, and the opening and closing and position of the gate can be intuitively judged according to the movement direction and position of the valve stem; 4. The height of the dark rod gate valve is small; Exposed rod gate valves require a large installation space; 5. The structure of the open rod gate valve is beneficial to the lubrication of the valve stem, and the degree of opening and closing is obvious; The stem thread of the dark rod gate valve not only cannot be lubricated, but also directly accepts the erosion of the medium and is easy to be damaged. Therefore, open rod gate valves are more widely used.