Knowledge

Knowledge

Classification and introduction of pipe thread-(3)

Sealing pipe thread (R) The basic dimensions and tolerances of inch sealing pipe threads Cooperate way There are two matching methods for inch seal pipe threads: cylindrical internal thread and conical external thread form a “column/cone” fit; conical internal thread and conical external threa d form a “cone/cone” fit. European countries mainly use “column/cone” matching […]

Classification and introduction of pipe thread-(2)

“Cylinder/cone” and “cone/cone”. Two inch seal pipe threads use different thread ring gauges (cylindrical thread ring gauge and tapered thread ring gauge) and thread plug gauge (the position of the datum plane is different, the two datum planes are different Half-tooth apart). Pipe threads that pass the inspection in European countries may be unqualified if […]

Classification and introduction of pipe thread-(1)

Pipe thread is a thread used for connection on the pipe wall to the valves. There are 55-degree unsealed pipe threads and 55-degree sealed pipe threads. Mainly used to connect pipes to make the internal and external threads fit tightly. There are two types which are straight pipes thread and tapered pipes thread. Common pipe […]

Types and classifications of gate valves

Gate valve, also called plate gate valve, is mainly composed of valve body, bonnet, disc, valve stem, valve seat and sealing packing. It is one of the most common valve types in isolation valves. The main purpose of the gate valve is to cut off the fluid. For this reason, it is usually called a […]

What is the difference between lining and vulcanized valve seat?

There are three types of rubber seat. One is a soft seat, which can be installed and removed at will. It is elastic; the other is a backrest seat, which is a hard seat. The seat is knocked into the valve by external force. The body, but it can also be disassembled, which is much […]

The role and classification of valves

Valves have many functions. Different valves should be selected for different functions. Different types of valves have different structures. These functions are all means to effectively control the process and ensure safety. Valves are generally divided into automatic valves and drive valves. Automatic valves (such as safety valves, pressure reducing valves, steam traps, check valves) […]

Valve selection basis and selection guide

How to select the righty type of valve? the following article will give you an idea how to choose the right structure/type valve. Nowadays, there are more and more valves on the market, the types of valves are particularly complex, and the structures and materials are all different. The selection of valves is very important […]

Troubleshooting of check valve

Troubleshooting of check valve: 1. The disc is broken The reasons that cause the valve disc to break are: The pressure of the medium before and after the check valve is close to balance and they are “see-saw” each other. The valve disc often beats against the valve seat, and the disc made of some […]

Introduction of U-shaped flange butterfly valve

What is U-shaped flange connection butterfly valve? The U shaped butterfly valve is simple in structure, small in size and light in weight, and consists of only a few parts. Moreover, it can be opened and closed quickly by rotating 90°, and the operation is simple. At the same time, the valve has good fluid […]

Uses and characteristics of manual butterfly valve (4)

Installation and maintenance of manual butterfly valve: During installation, the disc should stop in the closed position. The opening position should be determined according to the rotation angle of the butterfly plate. For the butterfly valve with bypass valve, the bypass valve should be opened before opening, and the installation should be carried out according […]