What are the differences between needle valves and high-pressure stop valves?
Addtime：2023-02-25 From： View：495
I. Analysis of Needle-Type Valve
The valve core of a needle valve is a very sharp cone, which is inserted into the valve seat like a needle, hence the name. The needle valve is a type of valve that can be precisely adjusted and has wide applications. For example, the cutting distance in flame cutting and the knob for adjusting the flame temperature are both needle valves. The shape of the needle valve can withstand greater pressure than other types of valves and has good sealing performance, so it is generally used for sealing of small flow, high-pressure gas or liquid media. The shape of the needle valve is the most suitable for use with pressure gauges. The common shape of a needle valve is threaded connection.
The needle valve seals by pressing a cone, truncated cone or sphere into the center of the valve seat. It has excellent sealing performance and is suitable for working under high pressure, low flow rate and small diameter conditions; it is rarely used in large diameters, has good flow regulation performance, is prone to clogging in cases of significant temperature changes, and is likely to get stuck between the valve core and the valve seat. It is widely used in instruments, meters and control equipment.
II. Analysis of Check Valve
The high-pressure stop valve tightly seals the valve core sealing surface and the valve seat sealing surface by applying pressure, preventing the flow of the medium. It has a wide range of applications, is inexpensive, and has good adaptability and regulating performance. Due to its structural characteristics, the lower the pressure, the easier the sealing effect becomes, so it is widely used in medium and low pressure conditions. It is mostly used in process pipelines.
III. Differences between imported needle valves and imported globe valves
The criterion for determining whether it is a needle-shaped or truncated type is to observe whether the valve core (valve disc) is placed on top of the valve seat or inserted into it. (Especially for the needle valve with conical valve disc, its valve disc shape is very similar to that of a stop valve). The specific and detailed differences between them are as follows
1. Sealing surface, this is the fundamental difference between a high-pressure stop valve and a needle valve. The sealing surface of a direct valve is formed by embedding polytetrafluoroethylene or metal into the valve disc of the stop valve, while the sealing surface of a needle valve is conical in shape.
2. Bore diameter: High-pressure stop valves usually come in various large bore diameters, ranging from DN15 to DN1000; while needle valves are generally of smaller bore diameters, such as the VTON needle valve, with a bore diameter of DN1 to DN50.
3. Imported Needle Valves Compared with other types of valves, these needle valves can withstand greater pressure and have better sealing performance. Therefore, they are generally used for sealing of gases or liquids with low flow rates and high pressures, as well as for pipeline sealing. Pressure switches. It is more appropriate to use needle valves with pressure gauges. Generally, needle valves are connected by threads (of course, there are other connection methods such as flanges). This makes it convenient to use pairs of pressure gauges. Needle valves for particularly corrosive media can also be made with bellows sealing elements.
4. The needle valve is a type of valve that can be precisely adjusted and is widely used. For example, the knob used to adjust the cutting distance in flame cutting and the knob for regulating the flame temperature are both needle valves. The instrument needle valve is an important component of the instrument measurement pipeline system. It mainly consists of stop valves and ball valves, and its function is to open or close the pipeline passage. The needle valve can withstand greater pressure than other types of valves and has excellent sealing performance. Therefore, it is generally used for smaller flow rates and higher sealing of pressurized gas or liquid media. The needle valve shape used in pressure gauges is more suitable. The common needle valve shape is threaded connection.
In summary, the needle valve is a type of valve belonging to the instrument category. It is mainly used for instruments and high pressure, and the connection methods include threads, welding, and flared sleeves. The globe valve is a type of valve for controlling the opening and closing of pipelines, and it is mainly used for large-diameter pipeline openings and closings.
The valve core of a needle valve is a very sharp cone, which is inserted into the valve seat like a needle, hence the name. The needle valve is a type of valve that can be precisely adjusted and has wide applications. For example, the cutting distance in flame cutting and the knob for adjusting the flame temperature are both needle valves. The shape of the needle valve can withstand greater pressure than other types of valves and has good sealing performance, so it is generally used for sealing of small flow, high-pressure gas or liquid media. The shape of the needle valve is the most suitable for use with pressure gauges. The common shape of a needle valve is threaded connection.
The needle valve seals by pressing a cone, truncated cone or sphere into the center of the valve seat. It has excellent sealing performance and is suitable for working under high pressure, low flow rate and small diameter conditions; it is rarely used in large diameters, has good flow regulation performance, is prone to clogging in cases of significant temperature changes, and is likely to get stuck between the valve core and the valve seat. It is widely used in instruments, meters and control equipment.
II. Analysis of Check Valve
The high-pressure stop valve tightly seals the valve core sealing surface and the valve seat sealing surface by applying pressure, preventing the flow of the medium. It has a wide range of applications, is inexpensive, and has good adaptability and regulating performance. Due to its structural characteristics, the lower the pressure, the easier the sealing effect becomes, so it is widely used in medium and low pressure conditions. It is mostly used in process pipelines.
III. Differences between imported needle valves and imported globe valves
The criterion for determining whether it is a needle-shaped or truncated type is to observe whether the valve core (valve disc) is placed on top of the valve seat or inserted into it. (Especially for the needle valve with conical valve disc, its valve disc shape is very similar to that of a stop valve). The specific and detailed differences between them are as follows
1. Sealing surface, this is the fundamental difference between a high-pressure stop valve and a needle valve. The sealing surface of a direct valve is formed by embedding polytetrafluoroethylene or metal into the valve disc of the stop valve, while the sealing surface of a needle valve is conical in shape.
2. Bore diameter: High-pressure stop valves usually come in various large bore diameters, ranging from DN15 to DN1000; while needle valves are generally of smaller bore diameters, such as the VTON needle valve, with a bore diameter of DN1 to DN50.
3. Imported Needle Valves Compared with other types of valves, these needle valves can withstand greater pressure and have better sealing performance. Therefore, they are generally used for sealing of gases or liquids with low flow rates and high pressures, as well as for pipeline sealing. Pressure switches. It is more appropriate to use needle valves with pressure gauges. Generally, needle valves are connected by threads (of course, there are other connection methods such as flanges). This makes it convenient to use pairs of pressure gauges. Needle valves for particularly corrosive media can also be made with bellows sealing elements.
4. The needle valve is a type of valve that can be precisely adjusted and is widely used. For example, the knob used to adjust the cutting distance in flame cutting and the knob for regulating the flame temperature are both needle valves. The instrument needle valve is an important component of the instrument measurement pipeline system. It mainly consists of stop valves and ball valves, and its function is to open or close the pipeline passage. The needle valve can withstand greater pressure than other types of valves and has excellent sealing performance. Therefore, it is generally used for smaller flow rates and higher sealing of pressurized gas or liquid media. The needle valve shape used in pressure gauges is more suitable. The common needle valve shape is threaded connection.
In summary, the needle valve is a type of valve belonging to the instrument category. It is mainly used for instruments and high pressure, and the connection methods include threads, welding, and flared sleeves. The globe valve is a type of valve for controlling the opening and closing of pipelines, and it is mainly used for large-diameter pipeline openings and closings.