Steam trap in the steam heating system plays a role in preventing steam drainage, choose the right trap, can make the steam heating equipment to achieve the highest efficiency. In order to achieve the best results, it is necessary to have a comprehensive understanding of the working performance and characteristics of various types of traps. There are many varieties of traps, each with d

In the fluid piping system, the valve is the control element, its main role is to isolate the equipment and piping system, regulate the flow rate, prevent backflow, regulate and discharge pressure. Because it is very important to choose the most suitable valve for the pipeline system, it is important to understand the characteristics of the valve and the steps and basis for select

1. Valve stem corrosion and protection Main causes of valve stem corrosion: The corrosion damage of the valve body is mainly caused by the corrosive medium, and the valve stem corrosion problem is mainly the packing. Not only the corrosive medium causes corrosion damage to the valve stem, but also the steam and water can make the valve stem and the packing contact spot. In part

Fixed shaft ball valve is commonly used on natural gas pipelines, and its general inspection method is: turn the valve to the fully open or fully closed position, and check whether there is leakage through the discharge of the valve body drain nozzle. If it can be drained clean, it proves that the seal is good. If there is always pressure discharge, the valve can be considered to be leak

1. Inspection of appearance and logo Check content: whether the appearance of the valve has defects, such as cracks, bubbles, dents, etc. Check signage, nameplate and finish for compliance. Standards: International standards including API 598, ASME B16.34, ISO 5208, etc. Chinese standards include GB/T 12224 (general requirements for steel valves), GB/T 12237 (steel ball valv

Ball valve has many kinds of structure, but basically the same little difference, are the opening and closing parts for the round ball core, mainly by the valve seat, ball, sealing ring, stem and other driving devices, etc., through the stem rotation 90 degrees to achieve the opening and closing of the valve, in the pipeline for shutting off, distribution, adjust the flow size and change

In the thermal system, the thermal trap plays a very important role, and its performance directly affects the stability and energy efficiency of the steam system. As the key equipment in the steam system, the thermal trap can not only automatically remove condensate, prevent the occurrence of water hammer phenomenon, but also effectively prevent the leakage of steam to ensure the

Gate valves usually have single gate, double gate, wedge, parallel and other structural designs, in which wedge double gate (Z42, Z62 series) and wedge elastic gate (Z40, Z60 series) are the most widely used, the former is closed, the gate automatically fits both sides of the seat, automatically compensates the wedge Angle processing position error; The latter relies on the elasti

The sealing performance of the valve directly affects the control effect of the fluid medium and the safe operation of the system, the grinding of the valve sealing surface is one of the important means to ensure its sealing performance, its main purpose is to eliminate the uneven sealing surface, defects and particles, improve the surface smoothness and roughness, so as to achiev

Sealing surface is the most critical working face of the valve, the quality of the sealing surface directly affects the service life of the valve, and the material of the sealing surface is an important factor to ensure the quality of the sealing surface. Therefore, the following factors should be considered when selecting valve sealing surface materials: ① Corrosion resistance.

The electric actuator of valve ‍ is used to control the valve. If the valve cannot be opened and closed due to some factors, such as power failure, failure of the electric actuator, or is fixed in a certain position, it needs to be operated by hand wheel. So, what should we pay attention to when the valve actuator ‍ needs to be manually operated? Matters needing atte

Pressure valve is a device used in hydraulic system to control and regulate liquid flow pressure. Its working principle is based on the balance between the liquid pressure on the spool and the spring force. When the pressure in the hydraulic system exceeds the pressure set by the seat, the seat will be subjected to upward force, so that the disc is separated from the seat, and th

Because the seal plays a role in cutting and connecting, adjusting and distributing, separating and mixing media on the valve channel, the sealing surface is often subjected to medium corrosion, erosion, wear and easily damaged. The reasons for the damage of sealing surface are man-made damage and natural damage. Artificial damage, is due to the design and manufacture not jing, m

01, cleaning method The welding slag, rust, and residue in the pipeline cause blockage or jam in the throttle orifice, guide part, and balance hole of the lower valve cover, resulting in strain and scratch on the spool surface and guide surface, and indentation on the sealing surface. This often occurs in the initial phase of operation after a new system is put into operation and

Valve body blank heat treatment process according to different materials are as follows: 1. Heat treatment of gray cast iron In order to achieve different purposes, gray cast iron can be subjected to different heat treatments after casting. In the production of valve, the heat treatment processes commonly used for gray cast iron valve body and other parts after casting are: the