Uses and common faults of stainless steel pressure gauges

Stainless steel pressure gauge use

Stainless steel pressure gauges are widely used in petroleum, chemical, chemical fiber, metallurgy, power station, food and other industrial sectors to measure the pressure of various fluid media in process flows with high requirements for corrosion resistance and high temperature resistance.

The stainless steel pressure gauge consists of a pressure guide system (including joints, spring tubes, current limiting screws, etc.), a gear transmission mechanism, an indicating device (pointer and dial) and an outer shell (including a case, a cover, a glass, etc.).

For instruments filled with liquid (usually silicone oil or glycerin) in the casing, they can resist severe vibration in the working environment and reduce the pulsation effect of the medium pressure.

Analysis of common faults of stainless steel pressure gauges

First, the pointer does not move or moves very little. The reasons may be as follows: 1. The check valve is not open. 2. The pointer is loose and one end of the pointer touches the dial. 3. The center hole of the check joint sealing gasket is blocked, and the working medium cannot be transferred into the pressure gauge. 4. The medium in the check oil cup is too dirty, blocking the spring tube or the transmission channel. 5. The rubber cup at the top of the check screw is damaged or the spring tube is broken, resulting in a large amount of oil leakage.

Second, the pointer is moving backwards. The checker is leaking oil or the oil cup needle valve is not smooth, resulting in poor sealing, or there may be cracks in the spring tube. These faults are common and easy to solve.

The third is the needle skipping phenomenon. The teeth of the sector gear may be rusted, worn, or dirty. Or the pointer shaft may be tilted, bent, and rubbed against one side of the dial.

Fourth, the pointer does not return to zero, the return error and tapping displacement are out of tolerance. The hairspring is not sufficiently tightened or expanded, or the pointer is loose.

Installation Precautions:

1. Selection of pressure measuring points. The selected pressure measuring points should reflect the measured pressure.

(1) Select the pipe section where the measured medium flows in a straight line, and avoid the pipe bends, forks, dead ends or other places where vortices are easily formed.

(2) When measuring the pressure of the flowing medium, the pressure point should be perpendicular to the flow direction and the drilling burrs should be removed.

(3) When measuring liquid pressure, the pressure point should be at the bottom of the pipeline so that no gas accumulates in the pressure pipe. When measuring gas, the pressure point should be at the top of the pipeline so that no liquid accumulates in the pressure pipe.