soft seal Gate Valve
Overview
Among various types of valves, gate valves are the most widely used. Gate valve refers to a valve whose closing member (gate plate) moves along the vertical direction of the channel axis. It is mainly used to cut off the medium on the pipeline, that is, it is used fully open or fully closed. Generally, gate valves cannot be used to regulate flow. It can be applied to low temperature and low pressure as well as high temperature and high pressure, and can be used for various media according to different materials of the valve. However, intermediate valves are generally not used in pipelines transporting media such as mud. Gate valve has the following advantages:
① Small fluid resistance.
②The torque required for opening and closing is small.
③ It can be used on ring network pipelines where the medium flows in both directions, which means that the flow direction of the medium is not restricted. ④When fully open, the sealing surface is less eroded by the working medium than the stop valve.
⑤The body structure is relatively simple and the manufacturing process is good.
⑥The structure length is relatively short. Because gate valves have many advantages, they are used in a wide range of applications. Generally, gate valves are used as devices for cutting off the medium in pipelines with a diameter of ≥ DN50. Even on some small-diameter pipelines (such as DN15~DN40), some gate valves are still retained. Gate valves also have some shortcomings, mainly:
①The overall size and opening height are large, and the required installation space is also large.
② During the opening and closing process, there is relative friction between the sealing surfaces, resulting in greater wear and tear, and even scratches at high temperatures.
③ Generally, gate valves have two sealing pairs, which adds some difficulties to processing, grinding and maintenance.
④The opening and closing time is long. Gate valves have various structural types. The main difference is the structural type of sealing elements used. According to the structure of the sealing element, gate valves are often divided into several different types, and the most common forms are parallel gate valves and wedge gate valves; according to the structure of the valve stem, it can also be divided into lifting stem (rising stem) and rotating stem (non rising stem) gate valve.
Product Composition
For a long time, the general gate valves used in the market are commonly leaking and prone to rust. Our company introduces foreign technology to produce soft-sealing gate valves. It overcomes the shortcomings of ordinary gate valves such as poor sealing, elastic fatigue, and easy rusting. The soft seal gate valve is a replacement product of the traditional gate valve. It uses the elastic gate plate to compensate for slight deformation to achieve a good sealing effect. The valve has significant advantages such as light switching, reliable sealing, good elastic memory and long service life. It can be widely used It is used as a regulating and intercepting pouring device in fluid pipelines such as tap water, sewage, construction, food, electricity, medicine, metallurgy, textiles, and energy systems.
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Connector form
Connection end forms: raised face flange, full plane flange, ring connection flange, butt weld end connection, threaded connection, socket weld connection and combined connection, etc., and can also be customized according to customer requirements. The weld ends are manufactured in accordance with ASME B16.25 and require the user to provide the wall thickness of the pipe.
Medium flange gasket type for bolted valve bonnet
Gate type
Self-sealing valve bonnet
Standard packing structure
The valve is designed, manufactured and tested to achieve low leakage of 50PPMVOC as a standard. This article applies to all cast steel and forged steel gate valves, except for special requirements of the user. By increasing the valve stem diameter tolerance and strictly controlling the straightness of the valve stem and the smoothness of the packing surface, we ensure long-term low leakage of the valve stem.
Dynamic load packing structure
Valve stem packing form with butterfly spring compression. This form is mainly used in places where the valve often requires switching or under higher temperature and pressure changes to reduce frequent adjustments to the packing gland to compensate for packing consumption. Dynamic load packing gland The design provides continuous compression of the packing to ensure good sealing performance in long-term and changing operating environments. Different filler types and materials can be provided according to customer requirements.
Spacer ring
The combination of packing on the top and bottom of the spacer ring can effectively compress the packing. When liquid/gas cannot leak out, this structure is used to inject grease to lubricate the packing or recover leakage in the valve stem area.
Water seal
The stuffing chamber is designed as a water-sealed structure, and water with a pressure of 0.6-1.6 MPa is introduced into the interface. The friction is small and the sealing is good. It can isolate the system from the atmosphere and ensure good air tightness.
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