Blog

03

2020

/

08

How to calculate the pressure difference of the orifice plate

Wuhan Xiete Valve Technology Co., Ltd. is mainly committed to the technological innovation of high-pressure water descaling valve and high-pressure hydraulic press. Its main products include descaling injection valve, liquid filling valve, throttle orifice plate, electric heat tracing leak-proof gas drain, coking screw feeder, sintered roller distributor, balanced pneumatic stop valve, high-pressure pneumatic gate valve, etc.

01

2020

/

08

Introduction to the classification of throttle orifice plate

An orifice device is a device installed in a fluid pipeline. Its function and purpose is to measure fluid flow, thereby controlling and displaying fluid flow. Throttling devices are divided into orifice throttle, nozzle, venturi tube, etc. Among them, the throttle orifice plate has six common orifice plate products, let us briefly introduce these six common orifice plate products and their characteristics.

30

2020

/

07

Structure Description of Balanced Pneumatic Globe Valve

Balanced pneumatic globe valve refers to the switch part of the plug-shaped valve, the valve, the sealing surface is flat or conical, the valve along the fluid centerline linear movement. The movement of the valve stem has the lifting rod type (the valve stem rises and falls, but the hand wheel does not rise and fall) and the lifting rotating rod type (the hand wheel rotates and rises and falls together with the valve stem, and the nut is installed on the valve body). The stop valve is only suitable for full opening and full closing, and no adjustment and throttling are allowed. When the balanced pneumatic cut-off valve is opened, when the opening height of the valve is 25% ~ 30% of the nominal diameter, it means that the valve has reached the fully open position. Therefore, the fully open position of the cut-off valve should be determined by the stroke of the valve disc.

27

2020

/

07

Advantages of balanced pneumatic globe valve

The working principle of the electric shut-off valve and the American standard gate valve is to open or close the valve by rotating the valve. The gate valve has the advantages of light opening and closing, small size, large diameter, reliable sealing, simple structure and convenient maintenance. The sealing surface and the spherical surface are always closed and are not easily eroded by the medium. It has been widely used in various industries.

24

2020

/

07

Balanced pneumatic globe valve use description

Balanced pneumatic valve is usually fully open and fully closed. Considering the flow characteristics, globe valves and ball valves have the characteristics of short opening and closing stroke, fast speed, reliable sealing, and small opening and closing static torque. Therefore, both types of products are suitable. However, considering the reliability, the mainstream products are still pneumatic shut-off valves.

21

2020

/

07

How to maintain the valve during use

The valve can be used to control the flow of air, water, steam, various corrosive media and other types of fluid. Valve according to the material can be divided into stainless steel valves, cast steel valves, cast iron valves, carbon steel valves and other valve material. Wuhan Xiete Valve Technology Co., Ltd. production of valves can be customized according to user-specific parameters of non-standard. So, we in the process of long-term use of the valve should be how to maintain it? Wuhan Xiete warm tips valve maintenance should do the following: 1. close or open a valve, prohibit the use of long lever or long wrench wheel. 2. the valve stem thread often friction and collision with the valve stem nut, a certain amount of oil should be maintained at the screw,

21

2020

/

07

Regular inspection and maintenance of balanced pneumatic globe valve

The balanced pneumatic globe valve is a forced sealing valve, so when the valve is closed, pressure must be applied to the disc to force the sealing surface to not leak. When the medium enters the valve 6 from below the valve disc, the resistance that the operating force needs to overcome is the friction between the valve stem and the packing and the thrust generated by the medium pressure. The force to close the valve is greater than the force to open the valve, so the diameter of the valve stem should be larger, otherwise, the valve stem will bend. Since the emergence of self-sealing valves, the medium flow direction of balanced pneumatic globe valves has changed from above the valve clack to the valve cavity. At this time, under the action of medium pressure, the force to close the valve is very small, and the force to open the valve is very

20

2020

/

07

The difference between throttling orifice plate and limiting orifice plate

The measurement principle of the throttle orifice plate device is that when the fluid filling the pipe flows through the orifice plate, local contraction will occur, the flow beam will be concentrated, the flow rate will increase, and the static pressure will decrease. Therefore, there will be a static pressure difference before and after the orifice plate, which has a certain functional relationship with the flow rate. The greater the flow rate of the orifice, the greater the pressure difference. The differential pressure signal is transmitted to the differential pressure transmitter through the pressure conduit and converted to a standard signal of 4 to 20 mA. DC, and then display the instantaneous and cumulative flow in the pipeline through the flow indicator. There are three commonly used pressure taking methods for orifice plate throttling devices: angle pressure taking (ring chamber \drilling) and flange pressure taking. Throttle orifice plate

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