What is the difference between a globe valve and a gate valve?

The difference between globe valve and gate valve.

1. Structure. Globe valves have a spherical, taper, and flat spool that is pressed down to the seat and sealed, and the disc of the globe valve is parallel to the fluid. The spool of the gate valve is a ram, which is snapped down to the front and rear valve seats for sealing. The disc of the gate valve is a ram and is perpendicular to the direction of the fluid.

2. Working principle.

The globe valve works with a rising valve stem type, and the handwheel rotates and rises with the valve stem. The gate valve works by rotating the handwheel and the valve stem does a rising motion.

3. Installation method.

When the shut-off valve is installed, the medium can enter from below and above the spool, while the flow direction of the gate valve is the same from below and above. There are no inlet and outlet direction requirements for gate valves, and there are regulations for inlet and outlet of globe valves.

4. Resistance to fluid.

The flow resistance of the gate valve to the fluid is relatively small, and the flow resistance coefficient of the ordinary gate valve is about and the opening and closing force is small. The medium can flow in both directions. Whereas, the resistance coefficient of an ordinary globe valve is about.

5. Flow and function.

The gate valve is required to be fully open, and the globe valve is not required to be fully open. Globe valves are generally used for pressure flow control, and gate valves are used for isolation.

Gate valves and globe valves are used in our lives, so what is the difference between gate valves and globe valves?

Introduction to Gate ValvesThe valve is used as a shut-off medium, and the entire flow is straight when fully opened, and the pressure loss of the medium operation is small. Gate valves are usually suitable for applications where the gate does not need to be opened and closed as often as possible, and the ram is kept fully open or closed. Not intended for use as conditioning or throttling.

For high-velocity flowing media, the gate can cause vibration in the partial opening condition of the gate, and the vibration may damage the sealing surface of the gate and the valve seat.

Introduction to shut-off valvesTo put it simply, the principle of the globe valve is to use the torque of the valve stem to give a downward pressure to the sealing surface, and rely on the pressure of the valve bar to make the sealing surface of the valve disc and the sealing surface of the valve seat fit tightly, so as to prevent the inflow of the medium or adjust the flow rate of the medium. The opening and closing parts of the globe valve are cylindrical discs, the sealing surface is flat or conical, and the disc moves in a straight line along the center line of the fluid.

The difference between the twoThe structure is different, the gate valve is more complex than the globe valve, the height size is larger, and the gate valve is shorter and taller than the globe valve; The sealing surface is different, when the gate valve is opened and closed, the valve core and the valve seat sealing surface are always in contact and rubbing against each other, so the sealing surface is easy to wear; Once the disc of the globe valve is opened, the mechanical wear of its sealing surface is small; The flow resistance is different, the gate valve is straight through the whole flow channel when the hole is fully opened, which is compared with the stop valve, its advantage is that the fluid flow resistance is small, the flow resistance coefficient of the ordinary gate valve is about, and the resistance coefficient of the ordinary stop valve is about.

The difference between the gate valve and the globe valve is mainly reflected in the structure, working principle, installation flow direction of three aspects, the following is the introduction of the shouting body:

Gate valve (left) and shut-off valve (right).

1. The structure is different.

The structure of the gate valve will be more complex than the globe valve, and the gate valve will be higher than the globe valve in the case of the same caliber, and the globe valve will be longer than the gate valve; Gate valves also have open rods and concealed rods, but shut-off valves do not.

2. The working principle is different.

The globe valve is a rising valve stem type when it is opened and closed, and the handwheel will follow the valve stem to do the rotating and lifting movement with the stem when the handwheel is turned; The gate valve is a rotating handwheel, so that the valve stem does a lifting movement, and the position of the handwheel itself remains unchanged.

3. The installation flow direction is different.

The effect of the gate valve flow in both directions is the same, and there is no requirement for the installation of the inlet and outlet directions, and the interception and seepage stop valve needs to be installed in strict accordance with the direction marked by the arrow of the valve body.

The difference between gate valve and globe valve is different structure, different sealing surface, and different flow resistance, as follows:

1. The structure is different

There is a certain difference between the structure of the globe valve and the gate valve, the structure of the gate valve is more complex than the globe valve, the height and size will be larger, the gate valve is shorter than the globe valve and higher from the appearance, and the open rod gate valve needs a higher height space, and the importance of selection must be paid attention to under the limited installation space.

2. The sealing surface is different

Once the disc of the globe valve is opened, there will be no contact between the seat and the sealing surface of the disc, and the mechanical wear of the sealing surface will be small, and if the medium contains solid particles, it is very easy to damage the sealing surface. When the gate valve is opened and closed, the sealing surface of the valve core and the valve seat is always in contact and rubs against each other, so the sealing surface will be easily abrasive, especially when the valve is close to closing, the pressure difference between the front and back of the valve core will be very large, and the wear of the sealing surface will be more serious.

3. The flow resistance is different

When the gate valve is fully opened, the whole flow channel is straight, the pressure loss of the medium is the smallest, compared with the stop valve, its main advantage is that the resistance of the fluid flow is smaller, and the flow resistance coefficient of the general ordinary Ahaochang gate valve is mostly around, and the resistance coefficient of the ordinary globe valve is mostly around.

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 are the top ten domestic first-line valve brand manufacturers in 2022-2023, but for reference only: Suzhou Neway Valve Co., Ltd., Shanghai Guanlong Valve Machinery, Shanghai Qizhong Valve Manufacturing, 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 due to 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 affects the satisfaction and trust of the stove 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 sealing surface of the gate valve is different, the sealing surface of the gate valve is easy to wear, while the mechanical wear of the sealing surface of the globe valve is small;

2. The structure is different, and the structure of the gate valve is more complex than that of the stop valve;

3. The flow resistance is different, and the fluid flow resistance of the gate valve is smaller than that of the globe valve.