Method for checking and detecting sealing surface of stop valves and regulating valves after online grinding

Abstract

The invention discloses a method for checking and detecting sealing surfaces of stop valves and regulating valves after online grinding. Existing on-line check valves and regulating valve sealing surfaces are checked through direct contact of valve clacks and valve seats, deviation caused by centering of valve rods cannot be solved, and the problems that the check of the valve sealing surfaces isqualified and inner leakage exists are solved. The composition of the invention comprises: a valve seat (1), and a valve rod (3) is arranged in the valve seat; the bottom of the valve rod is connectedwith a valve clack (2); the sealing surface of the valve clack is attached to the sealing surface of the valve seat; a valve cover gasket (4) is arranged at a seam allowance above the valve seat; a valve cover gasket is attached to a lower spigot of the valve cover (5); the valve seat and the valve cover are connected through a stud bolt (6) and are fixed through a nut (7), symmetrical four-pointpositions are taken from the fastened valve cover, marks are made, all the nuts on the valve cover are fastened, and the gap between the valve cover and the four-point mark of the valve seat is measured until the numerical difference value of the measured four points is smaller than 0.10 mm. The method is used for checking and detecting the sealing surface of the stop 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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