The opening problem of the root valve of the pressure gauge on the pump, equipment, and pipeline

Try to open it as high as possible. If the vibration is too large, resonance will occur. Please tidy up the pressure pipe. In addition, shock-proof pressure gauges should be used where the equipment vibrates during operation.

The opening of the root valve of the pressure gauge on pumps, equipment, and pipelines is generally one-third, so that it can be quickly closed in a crisis situation.

Theoretically, the valve in front of the pressure gauge should be fully open, so that the true change in pressure can be measured. If the pressure gauge's indication fluctuates greatly, it means that the measured pressure does fluctuate. Sometimes the pressure gauge vibrates, which is affected by the vibration of the pipeline, causing the indication to shake. This has certain requirements for installation and sampling, and the impact of mechanical vibration should be reduced as much as possible. Sometimes, the sensitivity of the pressure gauge is too high, and it will shake frequently and the indication cannot be seen clearly. You can set the sensitivity lower (within the allowable pressure change range), or choose a shock-proof pressure gauge, which will have a damping effect and make the indication more stable.

It should be fully open, but if there is an emergency to deal with, that is a different matter. It can be prevented in advance and checked frequently. You can put the switch wrench away as a precaution.

For large pressure fluctuations, compensation elbows are simmered into a round shape and then installed vertically to avoid direct impact on the pressure gauge. You can also purchase finished products directly.

The design of the pressure gauge should be improved. Our company uses a pressure gauge with buffer oil in the gauge and a compensated duct. First, it can reduce the direct impact on the pressure gauge. Second, when the pressure fluctuates greatly, the pointer will not be damaged by instantaneous overpressure! :)

I think it is better to have a smaller opening, so that it can be closed quickly in case of an accident or problem. Generally, the hand valve is fully closed, and then opened a circle, which can truly reflect the pressure. The opening may be different for different materials.

Ours is usually a ball valve, which is usually fully open:lol

I support the 6th floor. If the opening is too small, it is difficult to reflect the real pressure changes. Thank you for your advice~~:lol

A small opening will not reflect accurate readings at the moment of process fluctuations, but it will recover soon. Generally, good watches will also have dampers. In addition, if the process is easy to crystallize, choose a watch with a diaphragm.

When the manual valve is designed, it is not used for adjustment. It is either fully closed or fully open.

I personally understand that the opening of the valve on the equipment should be larger to reflect the real pressure changes. The pump outlet fluctuates greatly. If the opening is large, it will inevitably have a great impact on the pressure gauge. In our company, all pump outlet pressure gauges have circular buffers. Some of the partially solidified and poisonous gauges also have buffer isolation devices. Some pressure gauges with drastic pressure changes are also equipped with pressure gauges with buffer pointers. Except for the small fluctuations of the buffer fluid, the other ones have large pointer vibrations. Many gauges cannot return to zero, and many directly break the gears inside the gauge. Decreasing the valve opening at the root of the pressure gauge can obviously reduce the vibration. As long as the pressure can be seen to be changing, there should be no problem. The function of the pump outlet pressure gauge is to indicate the operating status of the pump. It does not need to be very accurate, and the hydraulic pressure can be said to be pervasive. As long as there is a little gap, in the non-flow state, the front and rear pressures are consistent and should not cause pressure changes. Therefore, I personally think that in order to protect the pressure gauge without affecting the judgment, it can be turned down to a very small value. For substances that are easy to solidify, just do a good job of heat tracing and insulation.

The valve at the root of the pressure gauge should be fully open. If the transported fluid is prone to fluctuations, the pressure-inducing pipe should be compensated by an elbow or a shock-proof pressure gauge should be used directly. For fluids that are prone to crystallization, clogging, and polymerization, it is better to use a diaphragm pressure gauge.

For clean media, just open it slightly. For crystallized media, open the valve fully and choose a durable valve.* * Use a force gauge, add a compensation elbow, and regularly open and close the root valve to prevent crystallization.

The required rated pressure is generally 1/3~2/3 of the measuring range of the meter. The pointer of the meter shakes violently. The specific situation should be analyzed in detail. The use of damping tubes, buffer holes, refueling and shock absorption, etc. actually reflect the average value of the actual pressure - my humble opinion!

Open it fully, unless there are special circumstances or special considerations. There are also ball valves, needle valves, and compensation rings. The choices vary according to needs, process requirements, and physical properties!

For high-temperature, flammable, explosive, toxic and harmful media, it only needs to be opened slightly to avoid excessive leakage, and it can be quickly closed to prevent leakage. If it is really clogged, then let’s deal with the problem of blockage. In short, safety comes first.

Do we also need to consider the characteristics of the medium in the pipeline? !

All I've ever learned is to open it a little lower, as long as it shows the pressure. I didn't understand why at the time. Later, as time passed, it probably had something to do with safety, as it could be quickly shut down in an accident. In addition, the pressure gauge shows pressure and has nothing to do with turning it up or down.

For ordinary valves, just open 2/3. At this opening, the flow rate of the valve basically reaches the full opening level. It is normal for the pressure gauge to display fluctuations. You can use a compensator or choose a shock-proof pressure gauge.