Can hard seated gate valves be used in water projects?

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.

It can be used for tap water projects (the water quality is better).

The sealing surface of the soft seal gate valve is rubber, and the valve plate is wrapped in rubber as a whole, which has a good sealing effect and the use temperature should not be too high.

The sealing surface of the hard seal gate valve is stainless steel or alloy, and the wedge seal is generally used, and the use temperature can be several.

The medium of the building system is generally water, the temperature is not high, and it is better to use a soft seal gate valve!

A hard seal is a metal-to-metal seal, and both the sealing ball and the seat are metal. The machining accuracy and process are relatively difficult, and it is generally used in high pressure, usually more than 35MPa. A soft seal is a seal between metal and non-metal, such as nylon PTFE.

The standard of manufacturing is the same.

First, the sealing material.

The elastic soft seal gate valve and the hard seal gate valve are the sealing materials of the valve seat, and the hard seal is precision machined with the valve seat material to ensure the matching accuracy with the valve core (ball), generally stainless steel and copper. Soft seals are seals that are embedded in the valve seat.

The material is a non-metallic material, because the soft sealing material has a certain elasticity, so the processing accuracy requirements will be lower than that of the hard seal.

Second, the manufacturing process.

Due to a lot of chemical industry, the working environment of the machinery industry is more complex, many are high temperature and high pressure, the friction resistance of the medium is large, the corrosiveness is strong, now the technology has progressed, the use of various materials is better, and the processing and other aspects can keep up, so that the hard seal ball valve has been widely promoted.

In fact, the principle of hard seal gate valve is the same as that of soft seal, but because it is a seal between metals, it is necessary to take into account the hardness relationship between metals, as well as working conditions, what medium to go, etc. Generally, it is required to do a hardening treatment, between the ball and the valve seat.

It is necessary to grind continuously to achieve a seal. The production cycle of hard seal gate valve is long, the processing is more complicated, and it is not easy to do a good job of hard seal ball valve.

Third, the conditions of use.

Soft seal gate valves can generally achieve high seals, while hard seal gate valves can be high or low according to requirements; Soft seals need to be fireproof, because at high temperatures, the material of the soft seal will leak, while the hard seal does not have this problem; Hard seals can generally be done.

high pressure, soft sealing is not possible; Due to the problem of the medium flowing, the soft seal cannot be used in some occasions (such as some corrosive media); Finally, hard-seal valves are generally more expensive than soft-sealed. As for manufacturing, there is not much difference between the two, Lord.

If the difference is the seat, the soft seal is non-metallic and the hard seal is metallic.

Fourth, in the selection of equipment.

The selection of soft and hard seal gate valves is mainly based on the process medium, temperature and pressure, the general medium contains solid particles or has wear or the temperature is higher than 200 degrees, it is best to choose hard seals, the diameter is greater than 50, the pressure difference of the valve is larger, and the torque of the opening valve is also considered.

When the torque is large, the fixed hard seal gate valve should be selected, and the sealing level can reach level 6 regardless of soft and hard sealing.

The difference is that the sealing surface of the ram is different.

Generally, gate valves generally have water leakage and easy rust. Soft seal gate valve (elastic seat seal gate valve), the gate plate is made of cast iron lined rubber, which overcomes the shortcomings of general gate valves, such as poor sealing, elastic fatigue, easy rust, etc. The soft seal gate valve is an updated product of the traditional gate valve, which uses the gate plate of elastic material, and uses the slight deformation compensation effect generated by the elastic material to achieve good sealing effect.

The soft-sealed gate valve has the significant advantages of light switching, reliable sealing, good elastic memory and long service life.

The ram plate of the hard sealing surface gate valve is cast iron or stainless steel, which has low opening and closing resistance and does not block the flow, but the sealing performance is poor.

The soft seal gate valve is a rubber seal, F sealed, and a hard seal gate valve is a medium of particles.

Hard-seated gate valve (left) and soft-seated gate valve (right).

1. The soft seal gate valve is suitable for non-corrosive gas-liquid medium at room temperature (80). Such as clean water, air, oil, water treatment sewage and other pipelines. And it has a good sealing effect, which can achieve almost zero leakage.

2. The hard seal gate valve is suitable for high temperature (425) with slightly corrosive gas liquid. Such as steam, heat transfer oil, sewage, petroleum, chemical, metallurgy, pipelines. It can have a certain degree of wear resistance.

3. The difference between soft seal gate valve and hard seal gate valve is that the sealing performance of soft seal is better than that of hard seal, but the temperature resistance and wear resistance of hard seal gate valve is better than that of soft seal gate valve.

Generally, the hard-sealed rubber skin of the soft seal cannot be heated and corroded, and our factory produces hard-sealed gate valves.

Cast iron with low pressure has a soft seal. Medium and high pressure are hard sealed.

It is soft-sealed without special requirements.

Yes. Soft seal gate valve, the sealing performance is better than hard sealing, suitable for operation in seawater.

The material depends on what you use! Some materials are not allowed!

Gate valve for large diameter and ball valve for small diameter.

The hard seal knife gate valve cannot reach zero leakage when it is overflowed, and the leakage amount specified in the standard is less than or equal to the value of cubic millimeters per second.

Gate valve is a valve that uses the gate plate as the opening and closing part and moves vertically along the liquid axis of the valve seat plexus to achieve the opening and closing action. The gate valve can only be fully opened and closed, the opening and closing parts are the ram, the direction of movement is perpendicular to the direction of the fluid, and the two sealing surfaces of the square I-beam gate valve form a wedge-shaped key and wedge-shaped angle with the parameters of the valve seepage, usually 5°, and 2°52' when the medium temperature is not high. To improve the manufacturability of the gate valve and make up for the deviation of the sealing surface angle in the processing process, this kind of gate is called elastic ram.

Our company's hard-sealed knife gate valve can achieve zero leakage.