Technical Knowledge
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Conversion of the Relationship between Valve Differential Pressure and Nominal Pressure and Pound Class
Differential Pressure The pressure difference usually refers to the pressure difference between two points of the valve in the pipeline, such as the pressure difference before and after the valve, and the pressure difference on both sides of the double flange, etc. It is not easy to calculate the...Read more -
What should enterprises do when valve leakage occurs in use? （II）
III. Leakage of sealing surface Cause: 1. The sealing surface is ground unevenly and cannot form a sealing line； 2. The top center of the connection between the valve stem and the closing part is suspended, out of alignment or worn； 3. The valve stem is bent or improperly assembled, which...Read more -
What should enterprises do when valve leakage occurs in use? （I）
I. Leakage due to falling off of closing parts Cause: 1. Improper operation will cause the closing part to jam or exceed the limit point, and the connection is damaged and broken; 2. The closing part is not firmly connected and falls off due to looseness; 3. The material of the selected co...Read more -
Selection and Scope of Eight (8) Types of Flange Gaskets (V)
06 Metal Spiral Wound Gasket The metal spiral wound gasket ingeniously utilizes the heat resistance, resilience and strength of metal and the flexibility of non-metallic materials, so the sealing performance is good, and the performance of stainless steel spiral wound flexible graphite gasket is ...Read more -
Selection and Scope of Eight (8) Types of Flange Gaskets (IV)
04 Asbestos Resin Board and Impregnated Asbestos Board Gasket It is mainly used for pipes, pumps, valves, inlet and outlet flanges of various acid media, with the service temperature of 80 ℃ and the pressure below 0.6MPa. Asbestos woven gasket is applicable to low pressure and high temperature c...Read more -
Selection and Scope of Eight (8) Types of Flange Gaskets (III)
03 Teflon (PTFE) Polytetrafluoroethylene (PTFE) is prone to cold flow and creep under pressure and high temperature, so it is generally used in low pressure, medium temperature, strong corrosion and non-polluting media, such as strong acid, strong alkali, halogen, drugs, etc. The safe use temper...Read more -
Selection and Scope of Eight (8) Types of Flange Gaskets (II)
02 Asbestos Rubber Sheet The price is lower than other gaskets and it is convenient to use; The biggest problem is that although rubber and some fillers are added to the gasket material, it is still unable to completely fill the tiny pores that are connected, and there is a small amount of penetr...Read more -
Selection and Scope of Eight (8) Types of Flange Gaskets (I)
01 Industrial Rubber Natural rubber is suitable for water, sea water, air, inert gas, alkali, saltwater solution and other media, but it is not resistant to mineral oil and non-polar solvents. Its long-term use temperature does not exceed 90 ℃, and its low temperature performance is excellent. It...Read more -
Overall Strategy of Valve Selection (VI)
4. Selection description of throttle valve The throttle valve is applicable to the occasions where the medium temperature is low, and the pressure is high. It is applicable to the parts where the flow and pressure need to be adjusted. It is not applicable to the medium with high viscosity and...Read more -
Overall Strategy of Valve Selection (V)
Description of valve options 1. Selection of gate valve In general, gate valves shall be preferred. Gate valve is not only suitable for medium such as steam and oil, but also suitable for medium containing granular solid and high viscosity, as well as valves for venting and low vacuum systems...Read more -
Overall Strategy of Valve Selection (IV)
Principles for valve selection 1. Valves for cut-off and opening media The flow channel is a straight-through valve, its flow resistance is small, which is usually selected as the valve for cut-off and opening medium. The downward closed valve (globe valve, plunger valve) is less selected because...Read more -
Overall Strategy of Valve Selection (III)
Basis for valve selection The valve procurement personnel shall further understand the basis for valve selection while understanding the steps of valve selection. 1. The purpose, operating conditions and control methods of the selected valves. 2. Nature of the working medium: working pressure, w...Read more