In water supply engineering, are there more open rod gate valves or dark rod gate valves?

I am glad to answer for you, according to the experience of on-site management personnel, there are more open rod gate valves used in water supply projects, which is related to the characteristics of open rod gate valves, because it is easier to observe the opening state of the valve and more convenient to check and solve problems.

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.

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

2.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 method Hulaolan gate valve is exposed, the nut is close to the handwheel and is fixed (no rotation and no axial movement), the ram is lifted by rotating the screw, the screw and the ram only have relative rotational motion and no relative axial displacement, and the appearance is a door-shaped bracket.

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.The advantages of open rod gate valves are:

The fluid resistance is small, and the sealing surface is scoured and eroded by the medium is small.

Less effort to open and close.

The flow direction of the medium is not restricted, and the flow is not disturbed and the pressure is not reduced.

The shape is simple, the structure length is short, the manufacturing process is good, and the application range is wide.

2.The disadvantages of open rod gate valves are:

It is easy to cause erosion and abrasion between the sealing surfaces, and it is difficult to maintain and judge.

The overall size is large, and a certain amount of space is required for opening, and the opening and closing time is long.

The structure is more complex.

3.The advantages of the dark rod gate valve are:

The height of the gate valve is always the same, so the installation space is small, and it is suitable for large diameters 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.

4.The disadvantages of dark rod gate valves are:

The stem thread not only cannot be moistened and slipped, but also directly accepts the erosion of the medium and is easy to damage.

The open rod means that when it is opened, the handwheel will not rise.

The dark rod means that when it is opened, the handwheel will rise with it.

To distinguish between the dark rod gate valve and the open rod gate valve, the top of the dark rod gate valve in the drawing is a small nut, and the open rod gate valve has a protective stem protective sleeve (with a certain height). I hope it can help you, if I really don't understand, I can go to the picture or chat privately.

There will be in the general drawing description.

Open rod: The stem nut is on the bonnet 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.

Dark rod: The stem nut is in the valve body, 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.

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.

The first-class fire engineer examination memorizes the mantra of the bright rod gate valve and the dark rod gate valve.

Crown valve pushing.

The functionality is the same.

The only difference is.

The open rod gate valve can be opened from the appearance, whether the valve is closed or open, and the open rod is generally used for fire fighting.

It is clear whether the valve is open or closed at the first time.

The dark rod had to be tried manually.