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Precautions for Installation and Maintenance of High Pressure Gate Valve
Release time:
2021/05/21 15:50
High-pressure gate valve, is the most widely used a valve, it is widely popular, is due to the opening and closing process between the tight cover friction is small, more durable, open height is not easy to manufacture, easy maintenance, not only suitable for low pressure, but also suitable for high pressure. Its closed principle is to rely on the valve bar pressure, so that the gate sealing surface and the valve seat sealing surface closely fit, to prevent the flow of media.
High-pressure gate valve allows only one-way flow of medium, directional installation. Its structural length is greater than the gate valve, and the fluid resistance is large, and the sealing reliability is not strong during long-term operation.
Advantages and disadvantages of high pressure gate valve and classification
Release time:
2021/05/21 15:48
The type of high-pressure gate valve according to the position of the stem thread is divided into external thread type, internal thread type, flange, welding and so on. According to the flow direction of the medium, there are straight-through, DC and angular. High pressure gate valve is mainly divided into the following categories: JB/T2203-1999 "gate valve structure length" based on the general class.
Introduction to the working principle of high pressure gate valve
Release time:
2021/05/21 15:47
The opening and closing parts of the high-pressure gate valve are the gate plate. The movement direction of the gate plate is perpendicular to the fluid direction. The gate valve can only be fully opened and fully closed, and cannot be adjusted and throttled. The opening and closing parts of the high-pressure gate valve are the gate plate. The movement direction of the gate plate is perpendicular to the fluid direction. The gate valve can only be fully opened and fully closed, and cannot be adjusted and throttled. The movement of the stem, there are lifting rod type (stem lifting, hand wheel does not lift), there are lifting rotating rod type (hand wheel and stem rotating lift, nut is located on the valve body).
Description of Common Valve Selection
Release time:
2021/05/21 15:44
The stop valve is suitable for pipelines with lax requirements on fluid resistance, I .e. pipelines or devices with little consideration on pressure loss and high temperature and high pressure medium, and is suitable for steam and other medium pipelines with DN<200mm. Small valves can be cut-off valves, such as needle valves, instrument valves, sampling valves, pressure gauge valves, etc. The stop valve has flow regulation or pressure regulation, but it does not require high regulation accuracy and the pipe diameter is relatively small, globe valve or throttle valve should be selected; for highly toxic media, bellows sealed globe valve should be selected; but the globe valve should not be used for medium with large viscosity and medium containing particles easy to precipitate, nor should it be used as vent valve and valve of low vacuum system.
Analysis of Key Points of Valve Selection
Release time:
2021/05/21 15:43
The correct choice of valve type is based on the designer's full grasp of the entire production process and operating conditions. When selecting the valve type, the designer should first grasp the structural characteristics and performance of each valve.
Which valves require flow direction selection? How?
Release time:
2021/05/21 15:41
Single-seal control valves such as single-seat valves, high-pressure valves, and single-seal sleeve valves without balancing holes need to be selected for flow direction. Flow open, flow closed each have advantages and disadvantages. Flow open type valve work is relatively stable, but the self-cleaning performance and sealing performance is poor, short life; flow closed type valve life is long, self-cleaning performance and sealing is good, but when the stem diameter is less than the valve core diameter stability is poor. Single-seat valve, small flow valve and single-seal sleeve valve are usually open and closed when flushing is severe or self-cleaning is required. Two-position type quick-opening characteristic regulating valve selects flow closing type.
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