Method for acceptance inspection of sealing surface of globe valve and control valve after online grinding

Abstract

The method is used for acceptance testing of the sealing surface of globe valves and regulating valves after online grinding. The existing on-line globe valve and regulating valve sealing surface acceptance inspection is the direct contact inspection between the disc and the valve seat, which cannot solve the deviation caused by the neutrality of the valve stem, resulting in the acceptance of the valve sealing surface but the problem of internal leakage. The composition of the present invention includes: a valve seat (1), a valve stem (3) is installed inside the valve seat, the bottom of the valve stem is connected to the valve flap (2), the sealing surface of the valve flap is bonded to the sealing surface of the valve seat, and the valve stem (3) above the valve seat A bonnet gasket (4) is installed at the seam, and the bonnet gasket fits with the lower seam of the bonnet (5), and the valve seat and the bonnet are connected by stud bolts (6) and nuts ( 7) Fix, take the symmetrical four-point position on the fastened bonnet, mark it, tighten all the nuts on the bonnet, measure the gap between the bonnet and the four-point marks on the valve seat, until the measured four-point value The difference is less than 0.10mm. The invention is used for the acceptance detection method of the sealing surface of the cut-off valve and the regulating valve after online grinding.

Description

technical field [0001] The invention relates to the field of energy technology, in particular to a method for acceptance detection of sealing surfaces of stop valves and regulating valves after online grinding. Background technique [0002] Due to the country's energy-saving requirements for energy-consuming industries such as electric power, new understanding of valve internal leakage has also been raised. The existing online check and acceptance method for the sealing surface of globe valves and control valves is the direct contact between the valve disc and the valve seat, which cannot be effectively solved. Due to the deviation caused by the neutrality of the valve stem, although the valve sealing surface has passed the acceptance test, there are still some internal leakage problems. The reliability of this method is not high, and although the operation is simple, multiple operations are required for confirmation, which increases the time for acceptance and detection and...

AI Technical Summary

Problems solved by technology

[0002] Due to the country's energy-saving requirements for energy-consuming industries such as electric power, new understanding of valve internal leakage has also been raised. The existing online check and acceptance method for the sealing surface of globe valves and control valves is the direct contact between the valve disc and the valve seat, which cannot be effectively solved. Due to the deviation caused by the neutrality of the valve stem, although the valve sealing surface has passed the acceptance, there are still some internal leakage problems

The reliability of this method is not high. Although the operation is simple, it needs multiple operations to confirm, which increases the time of acceptance inspection and reduces work efficiency.

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