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Valves Article
The evolution from packing seal to mechanical seal： The pump impeller is installed on the pump shaft that passes through the pump casing or volute. If there is no pump seal, the hollow "damp" part of the shaft entering the volute will become the source of continuous leakage. Over a hundred years ago, most pumps relied on packing to prevent pump leakage while allowing the shaft to rotate freely. Th...
Globe valve, also known as shut-off valve, belongs to the forced sealing type valve and is a type of shut-off valve. There are three types of connection methods: flange connection, threaded connection, and welded connection. The "Three Modernizations" of valves in our country once stipulated that the flow direction of globe valves should be from top to bottom, so there is directionality during ins...
Electromagnetic valves are automation basic components used to control fluids and belong to actuators; Not limited to hydraulic, pneumatic. Electromagnetic valves are used to control the direction of hydraulic flow, and mechanical devices in factories are generally controlled by hydraulic steel, so electromagnetic valves are used. The working principle of an electromagnetic valve is that there is ...
Valves are important components in the pipeline system of petrochemical plants, with a wide variety and large quantity, and are one of the main sources of leakage in the plant. Therefore, the requirements for valve leakage are crucial. The sealing performance of a valve refers to the ability of each sealing part of the valve to prevent medium leakage. The main sealing parts of a valve include the ...
1、 What is the principle of a shut-off valve? A globe valve uses the torque of the valve stem to exert downward pressure on the sealing surface, relying on the pressure of the valve stem to tightly fit the sealing surface of the valve disc and the sealing surface of the valve seat, preventing the flow of medium or regulating the flow rate of medium. 2、 What is the scope of application of globe val...
How to use a pressure regulating valve to reduce delay in the analysis system? The process measurement is real-time, but the analyzer response cannot be real-time. From sampling port to analysis There is always a delay in the instrument. Unfortunately, this delay is often underestimated or misunderstood. In the analysis sampling system, delay is defined as the time required for a new sample to tra...
The installation of safety valves and the key points of pipeline layout design 1. The safety valve should be installed upright and close to the protected equipment or pipeline. If the arrangement cannot be approached, the total pressure drop of the pipeline from the protected equipment or pipeline to the inlet of the safety valve should not exceed 3% of the fixed pressure value of the safety valve...
Pipe threads are mainly used for connecting pipes, making their internal and external threads fit tightly. There are two types: straight pipes and tapered pipes. The common types of pipe threads include NPT, PT, G, etc. The common types of pipe threads include NPT, PT, G, etc. (1) NPT is the abbreviation for National (American) Pipe Thread, which belongs to the American standard of 60 degree taper...
Y-shaped filters are an indispensable filtering device in pipeline systems for conveying media. Y-shaped filters are usually installed at the inlet of pressure reducing valves, relief valves, constant water level valves, or other equipment to remove impurities in the medium and protect the normal use of valves and equipment. The Y-shaped filter has the characteristics of advanced structure, low re...
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