Laizhou Dongsheng Valve Co., Ltd.
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Small guide for daily maintenance of valves
by admin on 22-07-20
Valves are not only widely used in various industries, but also used in different environments. Some valves in harsh working environments are prone to problems. Since the valve is an important equipment, especially for some large valves, it is quite troublesome to repair or replace once a problem...
Introduction to the use, main material and structural characteristics of the wafer check valve
by admin on 22-07-15
Check valve refers to a valve that automatically opens and closes the valve flap by relying on the flow of the medium itself to prevent the backflow of the medium, also known as check valve, one-way valve, reverse flow valve and back pressure valve. The check valve is an automatic valve whose mai...
Differences and commonalities between gate valves, ball valves, and butterfly valves
by admin on 22-07-13
The difference between gate valve, ball valve and butterfly valve: 01. Gate valve There is a flat plate in the valve body which is perpendicular to the flow direction of the medium, and the flat plate is lifted and lowered to realize opening and closing. Features: good airtightness, small fluid r...
Do stainless steel valves also rust?
by admin on 22-07-11
For stainless steel, it is generally considered to be a steel that is not easy to rust, but in fact stainless steel can also rust. The rust and corrosion resistance of stainless steel is due to the formation of a chromium-rich oxide film (passivation film) on its surface. This rust resistance and...
Normally open and normally closed type and selection of pneumatic or hydraulic actuators
by admin on 22-07-08
There are two types of single-acting pneumatic actuators: normally open and normally closed. In which case should the normally open type be used, and in which case should the normally closed type be used? Normally open: the valve is opened under the tension of the spring when the air is lost; th...
Soft sealing gate valve operation method and fault elimination method
by admin on 22-07-07
Many people want to know the operation method of soft-sealed gate valve in order to make better use of this valve. The following is the operation method and fault elimination method of soft-sealed gate valve: First, the opening and closing direction of the valve, many operators often make mista...
The difference between parallel gate valve and wedge gate valve
by admin on 22-03-08
What is a parallel gate valve: that is, the sealing surface is parallel to the vertical centerline, so the valve body and the sealing surface on the gate are also parallel to each other. The most common type of this kind of gate valve is the double gate type. In order to make the valve body and t...
Structural features of ball check valve
by admin on 22-01-25
The ball check valve is also called the ball sewage check valve. The valve body is made of nodular cast iron. The paint surface of the valve body is made of non-toxic epoxy paint after high temperature baking. The paint surface is flat, smooth and bright in color. The rubber-covered metal rolling...
Talk about “running and leaking” of valves
by admin on 21-12-20
One, the valve leakage, steam leakage prevention measures. 1. All valves must be subjected to hydraulic test of different grades after entering the factory. 2. It is necessary to disassemble and repair the valve must be ground. 3. During the overrepair, check whether the coiling is added an...
Introduction of valve materials for seawater desalination
by admin on 21-12-17
In recent years, with the improvement of people’s living standards and industrial development, the consumption of fresh water has increased year by year. In order to solve the water problem, many large-scale desalination projects are under intense construction in the country. In the process...
H71W stainless steel wafer lift check valve working principle and characteristics
by admin on 21-12-16
Stainless steel wafer lift check valve H71W/stainless steel one-way valve/wafer lift non-return valve adopts short structure size and single disc design. Compared with traditional swing check valve, this series of valves has no external Leakage, can be installed in any position, good sealing perf...
The operating temperature of the valve
by admin on 21-12-06
The operating temperature of the valve is determined by the material of the valve. The temperature of commonly used materials for valves is as follows: Valve operating temperature Gray cast iron valve: -15～250℃ Malleable cast iron valve: -15～250℃ Ductile iron valve: -30～350℃ High nic...
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