Blog

29

2018

/

10

High quality stainless steel globe valve

Stainless steel cut-off valve opening and closing parts is a plug-shaped valve, the sealing surface is flat or conical, the valve along the center line of the fluid for linear motion. The movement of the stem, there are lifting rod type (stem lifting, hand wheel does not lift), there are lifting rotating rod type (hand wheel and stem rotating lift, nut is located on the valve body). Stainless steel globe valve is only suitable for full opening and full closing, not allowed to adjust and throttle. Stainless steel cut-off valve is a forced seal valve, so when the valve is closed, pressure must be applied to the disc to force the sealing surface does not leak. When the medium enters from below the disc, the resistance that the operating force needs to overcome is the resistance of the valve stem and the packing.

23

2018

/

10

Relationship between valve diameter and medium flow rate

Valve flow and flow rate mainly depends on the diameter of the valve, but also with the structure of the valve on the resistance of the medium, at the same time with the valve pressure, temperature and the concentration of the medium and other factors have a certain intrinsic link. The flow area of the valve is directly related to the flow rate and flow rate, and the flow rate and flow rate are two interdependent quantities. When the flow rate is constant, the flow rate is large, and the flow channel area can be smaller; the flow rate is small, and the flow channel area can be larger. On the contrary, the flow channel area is large, its flow rate is small; the flow channel area is small, its flow rate is large. The flow rate of the medium is large, the valve diameter can be smaller, but the resistance loss is large, and the valve is easily damaged. Large flow rate, easy to flammable

15

2018

/

10

Butt welding bellows globe valve product structure characteristics

Main features of 1. butt-welded bellows globe valve: 1. Reasonable product structure, reliable sealing, excellent performance and beautiful appearance; 2. Surfacing Co-based hard alloy with sealing surface, wear resistance, corrosion resistance, good friction resistance and long service life; 3. Rod tempering and surface nitriding treatment have good corrosion resistance and friction resistance. 4, double seal, more reliable performance; 5. The lifting position indication of the valve stem is more intuitive. 6. The material of the parts, flange and butt welding number and size can be reasonably selected according to the actual working conditions or user requirements to meet various engineering needs. 2. butt-welded bellows globe valve product range: main material: carbon steel, stainless steel

10

2018

/

10

Causes and solutions of lax valve closure

During the use of the valve, there are often some perplexing problems, such as the valve is not closed tightly or tightly. If the valve is not closed tightly, first confirm whether the valve is closed in place. If there is still leakage and cannot be sealed after it has been closed in place, then check the sealing surface. Some valve sealing pairs are detachable, then take them out for grinding and testing again, if it is still not strictly closed, it must be returned to the factory for maintenance or replacement of the valve, so as not to affect the normal use of the valve and the occurrence of working conditions and other problems. If the valve is not closed tightly, first find out where the problem occurs, however

25

2018

/

09

How to select and inspect high quality valve blank

Machining commonly used blanks are castings, forgings, profiles and weldments. Different types of blanks and the accuracy, roughness and hardness of the blank have a direct impact on the machining process. The selection of valve blank should consider the following elements:(1) the material of the parts and the organization and performance requirements of the material. The part material specified on the design drawing generally determines the type of blank. For example: the part material is cast iron, it must be used to make the blank by casting method. For steel parts, the mechanical properties of the material should be considered when selecting the blank. For example, the manufacture of high-pressure valve parts should generally choose forgings or weldments,

17

2018

/

09

What are the advantages of pressure reducing valve

The water flow pressure is adjusted through the internal pipeline of the valve to meet various environments where the water pressure is strict. The use of a wide range of pressure reducing valves can also be used in some special places. First: the use of water saving pressure reducing valve can play the effect of energy saving, because the water leakage rate and water flow waste degree and water pressure city is proportional to, so reduce the water pressure, also can reduce the waste of water flow, it can be used in the city to improve the water system, to reduce the effect of water, to achieve the effect of energy saving. Second: the damage rate of the pipeline is proportional to the degree of pipeline wear. The pipeline is at high pressure for a long time.

13

2018

/

09

Faults in the operation of electric actuators are related to their advantages and disadvantages.

Electric actuator habit is called electric actuator, it is a kind of can provide linear or rotary motion drive device, it uses some kind of drive energy and work under the action of some kind of control signal. Electric actuators can be divided into two categories: straight stroke and angular stroke. It is an indispensable and important equipment in the automatic control system. Its main task is to convert the control signal sent by the regulator into linear displacement or angular displacement in proportion. Drive valves, baffles and other regulating mechanisms to achieve automatic control. Therefore, it is widely used in the automatic control field of electric power, metallurgy, petroleum, chemical and other industrial sectors. Although the electric actuator has a wide range of applications, the advantages are clear.

11

2018

/

09

Large diameter valve

1. Analysis of the reasons for the difficulty in opening and closing large-diameter valves: Generally, the flow direction of the stop valve is designed to be low and high. When people close the valve, the human body pushes the handwheel horizontally to rotate to make the valve flap move downward to realize closing. At this time, it is necessary to overcome the combination of three forces: 1) axial thrust; 2) Friction between packing and valve stem; 3) The larger the diameter of contact friction between the valve stem and valve disc core, the axial thrust is also larger, and when it is close to the closed state, the axial thrust is almost close to the actual pressure of the pipe network. 2. Analysis of the causes of internal leakage of large-diameter stop valves. Large-diameter stop valves are generally used in boiler outlets, main sub-cylinders, steam main pipe and other positions.

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