How to open and close the gate valve, how to open and close the gate valve

The valve turns the handwheel counterclockwise to open, and clockwise is closed.

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.

Valves are generally clockwise.

Close and open counterclockwise, that is, close the valve in the direction of S and open the valve in the direction of O. where s stands for shut=off and o stands for open=on.

If there is a handwheel, rotating it in the direction of the right thumb is on, and vice versa.

Generally, the manual ones are switched on and off by a handwheel, and some are automatically opened by the pressure of the water flow.

Clockwise. is off, counterclockwise is on. The rule of traditional switches is that clockwise is closed and counterclockwise is open, which is suitable for valves that do not clearly indicate the direction of opening and closing.

If the direction of the open or open arrow, the direction of the closed arrow is clearly indicated on the valve, and the direction of the arrow of shut or close, follow the instructions to rotate the switch. For valves that are not easy to judge and do not have a clear prompt, you can gently rotate the opening direction in the traditional way, and you can observe whether the valve responds to judge the opening and closing direction of the valve. <

Clockwise is off, counterclockwise is open.

1. The rule of the traditional switch is that clockwise is closed, counterclockwise is open, which is suitable for valves that do not clearly indicate the direction of opening and closing.

2. If the valve is clearly marked in the direction of the open or open arrow, the direction of the open or closed arrow, and the direction of the closed arrow, follow the instructions to rotate the switch.

3. For the valve that is not easy to judge and has no clear identification, you can gently rotate the opening direction according to the traditional way, and you can observe whether the valve responds to judge the opening and closing direction of the valve.

Valve:

1. The valve is a pipeline accessory used to open and close the pipeline, control the flow direction, adjust and control the parameters of the conveyed medium. According to its function, it can be divided into shut-off valve and check valve.

regulating valves, etc. 2. The valve is a control component in the fluid transportation system, which has the functions of shut-off, regulation, diversion, prevention of backflow, pressure stabilization, diversion or overflow pressure relief. Valves for fluid control systems, from the simplest shut-off valves.

to extremely complex automation systems.

The varieties and specifications of the various valves used in the are quite varied.

3. The valve can be used to control air, water, steam, various corrosive media, mud, oil and liquid metal.

and the flow of various types of fluids such as radioactive media.

The valve is generally closed clockwise and opened counterclockwise, that is, the valve is closed in the direction of the arrow pointing to S, and the valve is opened in the direction of O. where s stands for shut=off and o stands for open=on.

If there is a handwheel, rotating it in the direction of the right thumb is on, and vice versa.

Dear, hello, I am glad to answer for you: how to open and close the valve is as follows: 1. Usually the right direction is open, and the left side is closed.

The valve closes clockwise and opens counterclockwise. That is, the valve closes in the direction of the arrow pointing to S and the valve opens in the direction of O. where S stands for Off and O stands for Open.

If there is a hand wheel, turn it in the direction of the right thumb to open it, and in turn close the kind of valve, except for the safety valve, the rest of the valves are ball valves. The opening and closing operation of the ball valve is very simple, that is, the valve handle is rotated 90 degrees to complete the opening and closing action. In this deficiency, the valve stem is open when it is flat with the direction of the pipeline, and the valve handle is closed perpendicular to the pipeline.

The valve handle has an angle of 45 to the direction of the pipeline, which is in a half-open state, and it is not recommended to be half-open in the actual use process, either closed or fully open.

Clockwise is off, counterclockwise is on The same as natural gas, the knob is open along the direction of the tube, and perpendicular to the direction of the tube is off.

open--- open, shut--- closed.

When the handle and the pipe are at the intersection of the positive, it is closed, and when it is the intersection of the up, it is open.

Heating valve only refers to a kind of accessories of the radiator system, is a type of valve, the current heater system commonly used in the market valves are mainly divided into: gate valves, ball valves, safety valves, balance valves, globe valves, pressure stabilizing valves, pressure reducing valves, electropneumatic control valves, etc.

The valves on the heating pipes should not be opened and closed at will. Adjust the valves of each riser to the appropriate position;

Open the manual bleed valve of each radiator to expel the air trapped in the radiator, or open the exhaust valve of the gas collector installed on the top of the system until each radiator is warmed up.

The commissioning is complete, and once the commissioning is complete, the valve should be fixed and cannot be opened and closed at will. When opening the valve, turn the handwheel clockwise, turn the handwheel counterclockwise when closing, and rotate in place according to the opening and closing indication marks.

The radiator can not change the position arbitrarily, nor can it release water from the system at will, because if the hot water is lost, the water temperature in the pipe network will decrease rapidly, resulting in a decrease in indoor temperature. If the valve is found to be faulty, it should be stopped immediately, the cause should be found out and the fault should be removed.

Twisting to the left is to close, twisting to the right is to open the valve, pay attention to the arrow sign on the valve.

Installation of valves.

1) Before installing the valve, carefully check whether the model and specification of the valve used are consistent with the design;

2) Check whether the valve can be applied under the required conditions according to the model of the valve and the factory manual;

3) When the valve is hoisted, the rope should be tied to the flange connection between the valve body and the valve cover, and should not be tied to the handwheel or valve stem to avoid damage to the valve stem and the handwheel;

4) When installing the valve on the horizontal pipeline, the valve stem should be vertically upward, and the valve stem is not allowed to be installed downward;

5) When installing the valve, it is not allowed to use the forced counterpart connection method of raw pull and hard pulling, so as to avoid damage caused by uneven force;

6) The open rod gate valve should not be installed in the underground damp place to avoid the corrosion of the valve stem.

Classification of valves.

1) Cut-off valves: such as gate valves, globe valves, plug valves, ball valves, butterfly valves, needle valves, diaphragm valves, etc. Cut-off valves, also known as closed-circuit valves and globe valves, are used to connect or cut off the medium in the pipeline.

2) Check valve: such as check valve, check valve is also known as check valve or check valve, check valve is an automatic valve, its function is to prevent the medium in the pipeline from backflowing, to prevent the pump and drive motor from reversing, and the leakage of container medium. The foot valve of the suction off of the water pump also belongs to the category of check valves.

3) Safety: such as safety valves, explosion-proof valves, accident valves, etc. The function of the safety valve is to prevent the medium pressure in the pipeline or device from exceeding the specified value, so as to achieve the purpose of safety protection.

4) Regulation: such as regulating valves, throttle valves and pressure reducing valves, whose functions are to regulate the pressure, flow and other parameters of the medium.

5) Divert type: such as distribution valves, three-way valves, and traps. Its role is to distribute, separate, or mix media in the line.

6) Special purpose: such as pigging valve, venting valve, sewage valve, exhaust valve, filter, etc. Exhaust valve is an indispensable auxiliary component in the pipeline system, which is widely used in boilers, air conditioners, oil and gas, water supply and drainage pipelines.

It is often installed at the commanding height or elbow to remove excess gas in the pipeline, improve the efficiency of pipeline use and reduce energy consumption.

Daily valve maintenance.

1) The valve should be stored in a dry and ventilated room, and both ends of the passage must be blocked.

2) Valves stored for a long time should be checked regularly, the dirt should be removed, and the processing surface should be coated with anti-rust oil.

3) After installation, regular inspections should be carried out, and the main inspection items are:

a.Seal face wear.

b.Trapezoidal thread wear on the stem and stem nut.

c.Whether the filler is outdated and invalid, if it is damaged, it should be replaced in time.

d.After the valve is overhauled and assembled, the sealing performance test should be carried out.

Generally, valves (except ball valves) are open on the left and closed on the right (attention should be paid to the switch indication on the valve handle). In the process of opening and closing the valve, care should be taken to avoid damage caused by the transition force of the lead screw of the valve (resulting in leakage of the large cover and falling off of the valve plate and valve stem).

Manual valves are opened and closed by hand. The electrical control valve is switched on and off by an electrical signal.

What form of valve? Manually, directly turn the switch off. Electric? Pneumatic? What are the valves used for? With automatic protection no? Be specific.

Generally, valves (except ball valves) are left open and right closed (attention should be paid to the switch indication on the valve handle), in the process of opening and closing the valve, attention should be paid to avoid the valve screw transition stress, and damage (resulting in leakage of the large cover and the valve plate and valve stem falling off).

<> The opening and closing parts of the gate valve are the ram, and 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 two sealing surfaces of the most commonly used molded spike gate valve form 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 used to make 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.

When the gate valve is closed, the sealing surface can only rely on the medium pressure to seal, that is, rely on the medium pressure to press the sealing surface of the ram to the valve seat on the other side to ensure the sealing of the sealing surface, which is self-sealing. Most gate valves are forcibly sealed, that is, when the valve is closed, the ram should be forcibly pressed against the valve seat by external force to ensure the tightness of the sealing surface.

When the valve is opened, when the ram lift height is equal to 1:1 times the valve diameter, the flow of the fluid is completely unobstructed, but this position cannot be monitored during operation. In actual use, it is marked by the apex of the valve stem, that is, the position that cannot be opened, as its fully open position.

In order to account for the lock-up phenomenon of temperature changes, it is usually rewound back to the apex position and then reverses 1 2 1 turns as the position of the fully open valve. Therefore, the fully open position of the valve is determined by the position of the ram (i.e. the stroke).

If the gate plate of the gate valve moves in a straight line with the valve stem, it is called the lifting rod gate valve (also called the open rod gate valve). Usually there is a trapezoidal thread on the lifting rod, which changes the rotary motion into linear motion through the nut at the top of the valve and the guide groove on the valve body, that is, the operating torque into operating thrust.

Some gate valves, the stem nut is located on the gate, and the handwheel rotates to drive the valve stem to rotate, and the gate is lifted, this valve is called the rotary rod gate valve or the dark rod gate valve.

Valves are widely used in life, and can be seen everywhere in our homes, as long as they need to control the passage of gases and liquids. There are many kinds of valves in life, such as heating valves, tap water valves, etc., which are also divided into safety valves, check valves, globe valves, gate valves, butterfly valves, etc. Whether the control of the valve is standardized or not will also affect our safety in many cases, so understanding the direction of the valve and learning to operate the valve correctly is the common sense of life that every consumer needs to learn.

Now we will introduce the direction of the valve and how to operate the valve correctly.

The direction in which the valve is switched.

Under normal circumstances, all kinds of valves are clockwise is closed, counterclockwise is open, and there will be special marks in special cases. The switch is generally in the shape of a handle, the handle and the valve are fully open in the same direction, if there is a hand wheel, rotate to the direction of the right thumb is open, and vice versa. The handle is open along the pipe, and the handle is closed at 90 degrees from the pipe.

How to operate the valve correctly.

1. The manual valve is the most widely used valve, and its handwheel or handle is designed according to ordinary manpower, considering the strength of the sealing surface and the necessary closing force. Therefore, it is not possible to use a long lever or a long wrench to move the board. Some people are accustomed to using wrenches, and should pay strict attention not to use too much force, otherwise it is easy to damage the sealing surface, or break the handwheel and handle.

2. When opening and closing the valve, the force should be stable and not impactful. The components of some high-pressure valves for impact opening and closing have considered that this impact force cannot be compared with ordinary valves.

3. For the steam valve, before opening, it should be heated in advance, and the condensate should be excluded, and when opened, it should be as slow as possible to avoid water hammer.

4. When the valve is fully opened, the handwheel should be reversed a little to make the threads tighter to avoid loosening and damage. For open rod valves, remember the stem position when fully open and fully closed, and avoid hitting the upper dead center when fully open. It is also convenient to check whether it is normal when it is fully closed.

If the valve shaft falls off, or if a large debris is embedded between the spool seals, the position of the valve stem will change when it is fully closed.

5. When the pipeline is first used, there are more internal dirt, the valve can be slightly opened, the high-speed flow of the medium can be used to flush it away, and then gently close (can not be closed quickly, violently closed, in order to prevent residual impurities from pinch the sealing surface), open it again, repeat many times, flush out the dirt, and then put into normal work.