The difference between internal thread valve and external thread valve
Classification:
Release Time：2019-05-21
Threaded valve (also called thread valve, threaded valve or internal valve) generally refers to the valve body with internal thread or external thread of the valve, mainly divided into internal thread valve and external thread valve, the use of threaded connection and pipe corresponding. Generally, threaded valves can only be made with small diameters and are used for normal pressure or low pressure projects. If they are not available for high pressure work, they need to be used by welding link valves or flange connection valves. Common threaded valves are: threaded gate valve, threaded ball valve, threaded globe valve, threaded check valve. The difference between internal thread valve and external thread valve: from the use: due to the price, work flow needs, most of the market
Threaded valve (also called thread valve, threaded valve or internal valve) generally refers to the valve body with internal thread or external thread of the valve, mainly divided into internal thread valve and external thread valve, the use of threaded connection and pipe corresponding. Generally, threaded valves can only be made with small diameters and are used for normal pressure or low pressure projects. If they are not available for high pressure work, they need to be used by welding link valves or flange connection valves. Common threaded valves are: threaded gate valve, threaded ball valve, threaded globe valve, threaded check valve.
The difference between internal thread valve and external thread valve:
From the use: due to the price, work flow needs, the market is mostly with internal thread valve.
From the channel: considering the connection of the thread, the external thread of the same diameter has a smaller passage than the internal thread, the flow rate is fast, and the flow rate is small.
From the appearance: most of the lines of internal threads are pipe threads, most of the external threads are tapered threads, and the external threads of ferrule type are pipe threads.
From the pressure: the same material of the external thread of the valve wall is usually thicker than the internal thread (through the smaller, the thicker the wall), the greater the pressure resistance, which is the pressure level of the valve is the reason for the external thread.
Threaded valve sealing form:
1. Direct sealing: internal and external threads directly play a sealing role. In order to ensure that the joint does not leak, it is often filled with lead oil, linen and PTFE raw material tape; among them, PTFE raw material tape is widely used; this material has good corrosion resistance and excellent sealing effect. It is easy to use and store. When disassembling, it can be completely removed, because it is a non-sticky film, which is much superior to lead oil and linen.
2. Indirect sealing: the force of thread tightening is transmitted to the gasket between the two planes, so that the gasket plays a sealing role.
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