Blog

30

2018

/

07

The purchase method and type of shut-off valve

The choice of 1. structure type double sealing valve is one of the main disadvantages of large leakage. Single seal type control valve shall be selected. Sealing issues, reliability issues, maintenance and spare parts issues were all resolved. Now people began to look for a simpler structure, more reliable seal cut-off valve. At this time, it was found that the angle stroke valve is more superior than the straight stroke valve, so three eccentric cut-off butterfly valve, full-function cut-off valve and so on were produced. 2. sealing surface selection (1) face-to-face seal: common plunger valve core, its sealing surface is a small cone surface of 60 ℃, valve

16

2018

/

07

How to Deal with Internal Leakage and External Leakage of Stop Valve

The external leakage is easy to handle. For the leakage of the middle flange, tighten the bolt of the middle flange again. If not, open the middle flange gasket to see if there is any damage. For the leakage of the packing, tighten the packing gland. If the packing is too loose, add the packing. If the leakage is directly on the body, the low pressure can be welded. If the high pressure needs to be abandoned, safety comes first. For the internal leakage problem, the situation cannot be determined. First, it may not be closed tightly. Close it again. Second, the valve seat seal is damaged. This needs to be reground. For valve core damage, it depends on whether it is washed out or damaged by medium impact, but both must be welded again.

05

2018

/

07

Drainage valve construction matters needing attention

1. The main materials, equipment and products used in the construction are lack of technical quality appraisal documents or product certificates that meet the current standards issued by the state or the ministry. 2. The necessary quality inspection is not carried out before the valve is installed. Measures: before the valve installation, should do compressive strength and tightness test. 3. The specifications and models of the installed valves do not meet the design requirements. Measures: familiar with the scope of application of various types of valves, according to the design requirements of the selection of valve specifications and models. 4. The valve installation method is wrong. Measures: strictly according to the valve installation instructions for installation, open stem gate valve to keep full stem extension opening height, butterfly valve fully tested

02

2018

/

07

Wide range of electric actuators

Electric actuators are also customarily called electric actuators, electric heads. Including two parts: electric actuator and regulating valve. The control accuracy is mainly determined by the control performance of the electric actuator. It can convert the control signal of the system into the angular displacement and linear displacement of the output shaft, and control the position of the valve and other intercepting parts or other adjustment The mechanism makes the controlled medium work according to the system requirements. With the development of industrial automation, the requirements for industrial production automatic control systems are getting higher and higher, so the requirements for various electric actuators are getting higher and higher, which makes the market a variety of actuators flooding, varieties and shapes.

21

2018

/

06

Electric actuator control function

At present, there are two types of electric actuators, generally divided into part of the rotary electric actuator and multi-rotary electric actuator, the former mainly control the need for part of the rotary valve, the latter need to rotate the number of turns of the valve. Environmental conditions: refers to the environmental characteristics that can affect the performance of electric actuators, such as temperature, humidity, air pressure, magnetic field, mechanical shock, vibration, dust, etc. 2. Dynamic conditions: refers to the dynamic characteristics that can affect the performance of electric actuators. 3. Load conditions: refers to the load characteristics that can affect the performance of the electric actuator, such as torque, the type and characteristics of the controlled object, etc. 4,

19

2018

/

06

Forged steel globe valve three kinds of body cover connection form

The first: the body cover bolt connection forged steel globe valve, according to the design of this connection form of the valve, the valve body and the valve cover with bolts, wound gasket seal, the advantage is easy to repair. The second: the body cover welding connection forged steel globe valve, according to this connection form design of the valve, the valve body and the valve cover full welding seal, the advantage is no external leakage. The third type: pressure self-tightening valve cover forged steel globe valve, according to the design of this connection form of the valve, the valve body and the valve cover with screw mosquito connection, internal pressure from the sealing ring seal, the advantage is that the greater the internal pressure, the better the sealing performance. Wuhan Xiete Valve Technology Co., Ltd. reasonably selects according to the actual situation of customer requirements.

11

2018

/

06

Dynamic and static seals of valves

Valve dynamic seal, mainly refers to the stem seal. Do not let the valve with the valve stem movement and leakage of the medium, is the central subject of the valve dynamic seal. The basic form of stuffing box is:(1) gland type: this is the most used form. (2) compression nut type: this form, small size, but the pressing force is limited, only used in small valves. The filler has the following requirements:(1) good sealing;(2) corrosion resistance;(3) friction coefficient is small;(4) adapt to the medium temperature and pressure. Commonly used fillers are:(1) Asbestos packing: Asbestos packing has good temperature resistance and corrosion resistance, but when used alone, the sealing effect is not good, so it always

07

2018

/

06

Precautions when installing pipeline valves

Be sure to pay attention to check before installing the 1. 1. Carefully check whether the valve specifications and models meet the requirements of the drawings. 2. Check whether the valve stem and disc are flexible, stuck and skewed. 3. Check whether the valve is damaged and whether the thread of the threaded valve is correct and intact. 4. Check whether the combination of the valve seat and the valve body is firm, the connection between the valve clack and the valve seat, the valve cover and the valve body, the stem and the valve clack. 5. Check whether the valve gasket, packing and fasteners (bolts) are suitable for the requirements of the nature of the working medium. 6. The old or placed longer valve should be removed, dust, sand and other impurities must be cleaned with water. 7. Clear

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