Views:0 Author:Site Editor Publish Time: 2020-11-19 Origin:Site
There are many types of sampling valves, we often do not know which one is better to choose, so let's take a look at the advantages and disadvantages of various pneumatic Sanitary sampling valves.
The principles and advantages of cast steel sampling valve
The principles and advantages of flange clamp pneumatic Sanitary sampling valve
The principles and advantages of sampling valve with insulating jacket
The principles and advantages of double-open sampling valve
The principles and advantages of aseptic pneumatic sanitary sampling valve
Cast steel sampling valve has the following advantages: small fluid resistance, thin sealing surface media brush and small erosion. It takes less effort to open and close. The medium flow direction is not restricted, does not disturb the flow, does not reduce the pressure. The shape is simple, the structure length is short, the manufacturability is good, the application scope is wide. The structure is more complex. The sealing surface is easy to cause erosion and abrasion, so it is difficult to maintain. The external size is large, it needs certain space to open and close, and the opening and closing time is long.
The principle of the flange clamp pneumatic sanitary sampling valve is to seal the top valve stem and the tapered hole of the valve seat through the cone, and use the handwheel to separate the valve stem position in the sampling from the tapered hole, so that the medium flow direction of the tapered hole External sampling container.
During the use of the pneumatic sanitary sampling valve, if you need to use an insulating jacket, it should be noted that during the operation, the valve should not be forcibly opened before the middle is not completely melted, and the valve must wait until the crystal is opened in the valve, otherwise it is easy to cause a safety accident. When the pneumatic sanitary sampling valve is used together with the insulating jacket, care should be taken not to open it forcibly. When the valve cannot be opened, avoid using an extended torque arm, which will cause excessive force to the valve, cause the valve core and stem to fall off, or cause damage to the sampling components, causing safety hazards.
The double-open sampling valve is a relatively commonly used sampling valve, usually composed of two connected ball valves, which is characterized by safe and stable sampling. In the switching process, first close the valve closed equipment and the double-sided opening valve of the pipeline, then open valve B to let the medium injection space between the two valves, then close the valve and open the valve A, B and the sampling port of the sampling container to control sampling medium.
Its basic working principle is that when it is in a closed state, the casing is pushed by spring tension or other pressure, and the casing sealing rubber head is pressed against the opening of the tank wall to achieve a sealing effect; if sampling is required, steam or other sterilizing medium Fill the entire sample chamber through one of the sampling ports (usually below), exit from the other sampling port, and maintain sterility after a period of time. Then by twisting the handle, retracting the spring, loosening the sleeve, the sealant head is released from the opening of the tank wall, and the sample is discharged from the tank through the sample chamber and collected from the sampling port; after sampling, turn the handle to relax the spring , And then press the sealant head into the hole of the tank wall through the thimble. Inject clean water to drain the residual liquid in the sample cavity (if the sample is a clean medium such as sterile water, this step can be omitted), and then inject a sterile medium to seal and store it until the next sampling.
Only by understanding the advantages of various sampling valves can we choose a more suitable pneumatic sanitary sampling valve for ourselves and improve the working efficiency.