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The principle, function and classification of stop valve
Release time:
2017/07/12 21:52
Globe valve is forced to seal the valve category, when the valve is closed, must be applied to the disc pressure, in order to force the sealing surface does not leak. When the medium enters the valve from below the disc, the resistance that the operating force needs to overcome is the friction between the valve stem and the packing and the thrust generated by the pressure of the medium. The strength of closing the valve is greater than that of opening the valve. The diameter of the stem must be large, otherwise the failure of the stem top bending will occur. According to the connection of the valve is divided into three types: flange connection, thread connection, welding connection. After the self-sealing valve appears, the medium flow direction of the stop valve enters the valve cavity from above the valve clack.
Material Analysis of Casting Valve and Forged Valve
Release time:
2017/07/03 21:52
Casting valve is generally cast into the valve, under normal circumstances casting valve pressure grade is divided into high pressure, most of the caliber is above DN50. Forged valve is forged out, are generally used in high-grade pipeline, the caliber is relatively small, under normal circumstances are below DN50. Talking about the difference between the two: 1. casting valve 1, the so-called casting: is the process of smelting metal into a liquid that reaches certain requirements and pouring it into a casting mold, and obtaining a casting with a predetermined shape, size and performance after cooling, solidification, and cleaning. 2, cast out of the blank or parts cost is low, for the outside.
The advantages and disadvantages of stop valve and installation precautions
Release time:
2017/06/30 22:27
The advantages and disadvantages of the globe valve and the matters needing attention in the installation of the globe valve has the following advantages: 1. the shape of the structure is simple, manufacturing and maintenance is more convenient. 2. The working stroke is small and the opening and closing time is short. 3. Good sealing performance, small friction force between sealing surfaces, wear resistance and corrosion resistance, and long service life. The disadvantages of the cut-off valve are as follows: 1. The fluid resistance is large, and the force required to open and close is large. 2. It is not suitable for medium with particles, strong viscosity, dust and easy coking. According to the type of valve stem thread position is divided into two categories, external thread type, internal thread type. According to the flow direction of the medium, there are three categories, straight-through, straight-through and angle. Cut
Difference and relationship among nominal pressure, test pressure and working pressure
Release time:
2017/06/28 22:29
1. Nominal pressure (1) Nominal pressure-the compressive strength of the product at the reference temperature, expressed in PN, unit: MPa. (2) the reference temperature: material difference, the reference temperature will be different. For example, the reference temperature of steel is 250°C(3) and the nominal pressure is 1.0Mpa, which is marked as PN 1.0Mpa 2. Test pressure (1) The pressure for strength test of the product is expressed as Ps. (2) The test pressure is 4.0Mpa, which is recorded as Ps4.0Mpa. 3. Working pressure (1) The pressure on pipes and fittings under normal conditions is expressed in Pt. (2) t
Analysis and Preparedness Measures of Common Faults in the Application of Gate Valve
Release time:
2017/06/23 21:52
Problem 1: Leakage at the connection between the gate valve and the gate valve First check whether the bolts at the connection between the gate valve and the gate valve are tightened. If they are not tightened, the internal gasket ring and the flange sealing groove surface are not perfectly combined, resulting in leakage. The bolts and nuts shall be checked in sequence and all bolts shall be tightened until the gasket ring is pressed. Secondly, check the size and accuracy of the sealing gasket ring and flange sealing groove surface. If the sealing contact surface is incorrect or too rough, repair or replace the sealing gasket ring. Or check whether there are sand holes or impurities in the contact surface of the sealing gasket ring and the flange sealing groove. If there are these defects, they should be repaired accordingly,
Principle and Characteristics of Three Kinds of Gas Drainers
Release time:
2017/06/21 21:52
Brief introduction of 1. products: the anti-breakdown and leak-free gas drainer consists of a condensed water drainer and a leak-proof device. the height of the water seal is used to overcome the gas pressure, thus sealing the gas. when the effective water level of the drainer is abnormally lowered due to pressure fluctuation of the gas pipe network or other reasons, the gas pressure is higher than the height of the water seal, the leak-proof device acts, closes the overflow port, and prevents the gas leakage and prevents accidents. The heat tracing drain has two forms: steam heat tracing and electric heat tracing to ensure the normal operation of the drain in a low temperature environment. Dry type drainer is suitable for gas pipelines with small pipe diameter and less displacement. The pressure is less than 0.9MPa. If it is cold
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