Can the drain valve of the transmitter be omitted?
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Question: When using a pressure/differential pressure transmitter to measure liquid pressure, can the built-in drain plug of the transmitter completely replace a drain valve? That is, when the transmitter comes equipped with its own drain plug, can the drain valve be removed during equipment installation? Provide the answer along with the relevant standard references that support it. Please ask the experts for advice.
It’s best to be able to access it, as it makes maintenance easier and also helps in identifying faults during repairs
Yes, it’s best not to omit it; it is indeed very necessary to carry out maintenance and replace the isolation fluid, as well as to remove waste during use
Hello, no isolation fluid is required in this scenario. Are there any relevant specifications that specify whether the waste discharge valve can be omitted in this case?
Normally, some dirt accumulates in that small section of pipe where the drain valve is located; if there is no drain pipe, then the dirt accumulates on the diaphragm of the transmitter.
1. Pressure tapping pipes are generally made of 12mm tubes, with an inner diameter of 10mm. The exhaust port of the gauge is 1/8 size, with a diameter of only 3 mm. 2. Some dirt can accumulate in the vertical pipe section where the drain valve is located; if there is no drain pipe, then the dirt accumulates on the diaphragm of the transmitter. Therefore, it is not recommended to remove the waste pipe.
A pressure-sensitive valve on a belt is really unnecessary – it’s like adding extra features to something that already has enough. Those foreign products: people there have lots of hair on their arms and suffer from body odor. In those foreign countries, soaps are sold along with shaving knives, perfumes, and hair removal products, haha. :lol . {:2_36:} The monkey said: Er Gouzi is trying to imitate foreigners
This guy is so funny; what he said is really apt.
The drain valve of the transmitter is essential. The other functions of the drain valve are to discharge waste and to flush the pressure guide tube. The orifice size of the built-in vent and drain plugs on the transmitter is very small; impurities in the pressure guide tube cannot be removed at all. It is not possible to clean the pressure guide tube using the small orifices of these plugs. Moreover, for high-temperature or corrosive media, it is not allowed for such media to enter the transmitter’s measuring diaphragm box, as this would damage the transmitter.
Let’s use an analogy for this question: it would be very unpleasant for a person to have only a urethra and no anus； Many large objects still need to be expelled through the anus; the urethra is too narrow to allow their passage ；
What does the poster mean by wanting to omit the drain valve? The drain hole of the transmitter is provided for the maintenance and cleaning of the transmitter. The drain valve on the pipeline is a discharge outlet provided during operation to remove liquids in the pressure guiding tube that could affect the measurement process; the purposes of these two types of discharges are different. Is your company trying to save costs? If that’s the case, it’s best to simply buy the cheapest transmitter, or even eliminate these measurement points and use a mechanical gauge instead, so that the inspector can check it every few hours. .