What is the difference between cast iron flange open rod gate valve and cast iron flange gate valve?

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.

Gate valves can be divided into open rod gate valves and dark rod gate valves according to the different valve stems.

Therefore, cast iron flange gate valves can be divided into cast iron flange dark rod gate valves and cast iron flange open rod gate valves.

Cast iron flange open rod gate valve and cast iron flanged gate valve are included and included in the relationship.

The cast iron flange open rod gate valve is the open rod gate valve. The cast iron flange gate valve is the most conventional ordinary dark rod gate valve on the market.

Gate valves can be divided into the following according to the structure of the valve stem

1. Open rod gate valve: the stem nut is on the valve cover or bracket, and when the gate is opened and closed, the stem nut is rotated to realize the lifting of the valve stem. This structure is beneficial to the lubrication of the valve stem and has a clear degree of opening and closing, so it is widely used.

2. Dark rod gate valve: the stem nut is in the valve body, which is in direct contact with the medium. When opening and closing the gate, it is achieved by rotating the valve stem.

The advantage of this construction is that the height of the gate valve is always the same, so the installation space is small, and it is suitable for large diameter or gate valves with limited installation space. This structure should be equipped with an opening and closing indicator to indicate the degree of opening and closing.

The disadvantage of this structure is that the stem thread not only cannot be lubricated, but also directly accepts the erosion of the medium and is easily damaged.

Main Differences Between Open Rod Gate Valve and Dark Rod Gate Valve:

1. The lifting screw of the dark rod flange gate valve is only rotating without moving up and down, and only one rod is exposed, and its nut is fixed on the ram, and the ram is lifted by the rotation of the screw, and there is no visible gantry; The lifting screw of the open rod flange gate valve is exposed, and the nut is close to the handwheel and is fixed (not rotating or axially moving), and the ram is lifted by rotating the screw, and the screw and the ram have only relative rotational motion without relative axial displacement, and the appearance is a door-shaped bracket.

2. The dark rod valve cannot see the lead screw, while the open rod can see the screw rod.

3. When the dark rod valve is opened and closed, the steering wheel and the valve stem are connected together and relatively immovable, and it is through the rotation of the valve stem at the fixed point to drive the valve disc to lift up and down the gate to complete the opening and closing. Exposed rod valves raise or lower the disc through the threaded transmission between the stem and the steering wheel. To put it simply, the open rod valve is a valve disc that moves up and down together with the valve stem, and the steering wheel is always at a fixed point.

1. Advantages of cast iron open rod gate valve:

1.The fluid resistance is small, and the structure inside the valve body is straight-through, so the medium can be unimpeded;

2.The direction of movement of the gate plate of the cast iron open rod gate valve is perpendicular to the direction of the medium flow, and the opening and closing speed is fast and labor-saving;

3.The channels on both sides of the gate valve are symmetrical with each other, and the medium can flow arbitrarily in both directions, so that it is easy to install the cast iron open rod gate valve;

4.The structure is simple, the structure length is short, the manufacturing industry is good, it can be used in various fields, and the application range is wide;

5.Made of ductile iron, the valve body is very lightweight, only about 20% of the traditional gate valve30;

6.The structure is compact, the rigidity of the valve is good, the passage is smooth, the material of the sealing surface is unique, the sealing performance is reliable, and the service life is long.

Second, the principle of cast iron open rod gate valve:

Cast iron open-rod gate valves are the most commonly used shut-off valves in the valve family, and their main function is to connect and cut off the medium, usually placed high above the ground. The opening and closing gate plate of the gate valve is usually lifted in the valve body, and the valve stem only does rotary movement. Cast iron open-rod gate valves are suitable for a wide range of temperature, pressure and caliber, and are widely used in chemical, petroleum, metallurgy, gas, electric power, drainage, textile, construction and other industries.

The pneumatic pinch valve produced by Wuhu Naide Hose Valve Industry has excellent wear resistance and anti-corrosion performance, and its lining of special rubber has excellent performance in various properties. With wear-resistant, anti-corrosion and high-temperature resistant rubber as the lining layer, the physical and chemical properties of the rubber itself reduce the effect of the pipeline conveying medium on the external structure, such as impact force, corrosion, etc., due to the cushioning effect of rubber, greatly prolong the service life of the pipeline, reduce the cost of users. Wuhu Naide hose valve industry has nearly 20 years of valve research and production experience, and has close cooperation with major domestic mines and power plants.

The main points are as follows.

1. The fluid resistance is small, and its resistance coefficient is equal to that of the pipe section of the same length.

2. Simple structure, small size and light weight.

3. Tight and reliable, the sealing surface material of the gate valve is widely used plastic, with good sealing, and has been widely used in the vacuum system.

4. Easy to operate, fast opening and closing, from full open to full closed, only need to rotate 90°, which is convenient for long-distance control.

5. Easy maintenance, simple structure of gate valve, sealing ring is generally movable, and it is more convenient to disassemble and replace.

6. When fully open or fully closed, the sealing surface of the gate body and the valve seat is isolated from the medium, and the erosion of the sealing surface of the valve will not be caused when the medium passes. Hazelnut Electromechanical is quite good.

7. Wide range of application, from small to a few millimeters in diameter, from high vacuum to high pressure. When the ball rotates 90 degrees, the sphere should be fully present at the inlet and exit, thus cutting off the flow.