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What is a pilot-operated safety valve

What is a pilot-operated safety valve? Pilot-operated safety valve is a non-direct load type safety valve. It consists of a main valve and a pilot valve (also known as a “secondary valve”), which is driven by the medium discharged from the pilot valve and is also known as a “pulse safety valve” because the pressure in the system is pulsed. From a separate point of view, the pilot valve itself is also a direct-load safety valve. When the medium turn force reaches the opening pressure of the pilot valve, the pilot valve opens first and the discharged medium enters the […]

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What is grinding of valve sealing surface?

What is the grinding of valve sealing surface? Grinding, in the valve manufacturing process is a common finishing method for its sealing surface. Grinding can make the valve sealing surface to obtain high dimensional accuracy, geometric roughness and surface roughness, but can not improve the mutual position accuracy between the sealing surface surfaces. After grinding the valve sealing surface can usually reach the dimensional accuracy of 0.001-0.003mm; geometric shape accuracy (such as unevenness) of 0.001mm; surface roughness of 0.1-0.008. The basic principle of sealing surface grinding The basic principle of seal surface grinding includes eight aspects: cleaning and inspection process, […]

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Selection and installation precautions of oxygen valve

Based on the analysis of the characteristics of oxygen and the causes of combustion and explosion of oxygen pipes and oxygen valves, this paper puts forward suggestions on the selection and installation of oxygen valves. With the rapid development of industrial modernization and the continuous emergence of new processes and devices, the parameter range of oxygen valves is also constantly improving, and the requirements for oxygen valves are increasingly strict. Oxygen is a combustion promoter, especially high-temperature and high-pressure oxygen can not meet any spark, so anti-static performance is an important guarantee for stable operation of oxygen valve. The anti-static measures […]

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Complete guidance for quick closing valves

What is a quick closing valve? Quick-closing valve, also called main steam gate, is the main closing mechanism between the main steam pipeline and the turbine, which cuts off the steam inlet of the turbine in an emergency to stop the unit quickly for the purpose of protecting the unit. The quick closing valve is composed of the valve body and the cylinder. During operation, the valve is kept open by the quick closing oil to overcome the resistance of the spring. When the quick shutdown oil loses pressure, the piston disc and piston in the cylinder will be disconnected […]

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Pressure test method for industrial valves

In general, the strength test is not required for industrial valves in use, but the strength test shall be conducted for the repaired valve body and bonnet or the valve body and bonnet with corrosion damage. For the safety valve, its constant pressure, reseating pressure and other tests shall comply with its instructions and relevant regulations. Before valve installation, valve strength test and valve sealing test shall be conducted on the valve hydraulic test bench. Spot check 20% of low-pressure valves, and 100% of them shall be inspected if they are unqualified; Medium and high pressure valves shall be 100% […]

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A Complete Guide to Valves

What are valves? In fluid piping systems, valves are control elements whose main functions are to isolate equipment and piping systems, regulate flow, prevent backflow, and regulate and discharge pressure. They can be used to control the flow of various types of fluids such as air, water, steam, various corrosive media, slurries, oils, liquid metals, and radioactive media. As it becomes very important to select the most suitable valve for the piping system, it becomes vital to understand the characteristics of the valve and the steps and basis for selecting the valve. Classification of valves How to classify the valve? First, the valve, […]

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Selection and technical development of valves

According to the selection standard and actual use requirements of valves, the key contents in the selection process are analyzed and introduced. Put forward the key precautions in the process of valve selection, such as pressure grade, service temperature, connection form, bonnet sealing and sealing requirements. Through the analysis of the actual accident causes of typical valves, it is required to comprehensively consider the structure, material and service conditions of valves, and highlight the importance of valve selection for safe use. This paper introduces several advanced new valve technologies at present, and compares and analyzes the advantages and disadvantages of […]

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Discussion on selection and maintenance of valves in chemical system

In the production of various chemical industries, valves are indispensable and important equipment components and devices. The valve is a device that can cut off, adjust, check, divert, change the direction of the medium, control the medium pressure, separate the medium water and gas, and ensure the safety of the pipeline system. Therefore, the correct selection, operation and maintenance of the valve is very important. In addition, the valve is also a facility that controls the medium in the pipeline. It is treated as a pressure bearing element in the pipeline device, but it is also a valve that derives […]

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Types of Valves used in Piping

What is a valve? A valve is a mechanism that opens and closes to control the flow of fluids. In a scientific context, fluids include both liquids and gases. It is a device that is able to control, shut off, direct, or regulate the flow inside a pipeline by obstructing its flow direction, partially or completely, depending on the type of application. Valves can also work through pressure or temperature and maybe run by a motor or operated manually. The simplest valves are one way-flap mechanism that allows flow in one direction and shut with back-flow pressure to stop flow […]

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Understand the performance of valves: help you better choose valves

Why do we need to understand and consider the performance of the valve? Valves have different requirements according to their types and uses, mainly including sealing, strength, regulation, circulation, opening and closing, etc. In the process of selecting the valve, in addition to the basic parameters and performance, the performance of the valve should also be considered. So what are the performance characteristics of different valves? What are the types of valves? First of all, let’s take a look at the valves, which are mainly divided into the following categories. 1. Cut-off valve category Mainly used to cut off or […]

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