Problems with the thread depth of pressure gauge and thermometer dials
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When drawing equipment diagrams, is it necessary to specify the thread depth of the thermometer gauge head? For example, in the case of the thermometer gauge for M27X2, if the thread depth is too great, won’t several shims be needed in order to tighten the thermometer properly? What is the thread depth for typical bimetallic thermometers, pressure gauges, etc.?
I’m not sure if there’s a standard for this, but based on my experience, 15–20 mm is usually sufficient. Of course, if the pressure level is particularly high, a deeper depth may be required.
Generally, the thread depth of bimetallic thermometers, pressure gauges, etc., is fixed. The thread of the bimetallic thermometer is M27X2, while the threads of the pressure gauge are M20X1.5 and Z1/2” ； The Z1/4” (NPT) thread has a deep depth, allowing the thermometer to be tightened without the need for additional shims. Of course, if the pressure is high, it is best to use a flange connection.
The depth of the pressure gauge connector M20X1.5 should generally be less than 15 mm, the depth of the bimetallic thermometer connector M27X2 should generally be less than 18 mm, and the depth of the thermocouple connector M27X2 should generally be greater than 40 mm. Otherwise, problems will arise. However, these are all standard products; if you manufacture them yourself, it’s important to pay attention to these details.
Generally, the thread depth of bimetallic thermometers, pressure gauges, etc., is fixed. Have you measured it with a ruler? The depth of the pressure gauge connector M20X1.5 should generally be less than 15 mm; the depth of the bimetallic thermometer connector M27X2 should generally be less than 18 mm, while the depth of the thermocouple connector M27X2 should generally be greater than 40 mm. There must be a specific range specified, right? Please have the equipment manufacturer produce the equipment; they should fabricate the gauge heads themselves. Upon receipt, it was found that the thread depth was too great, making the devices unusable. If it’s too shallow and the thread is exposed, isn’t that also not good? How to connect flange joints? Aren’t all instruments threaded? Are there instruments with flanges?
How to connect flange joints? You need to ask such a simple question? You must not have seen instruments with flanges! For example, a \"bimetallic thermometer\" can also have flange connections; it doesn’t have to be threaded – you just need to specify how it should be manufactured when placing the order. I won’t mention the other instruments.