A seat surface sealing test tool and its use method

Abstract

The invention relates to the technical field of valve stem detecting equipment, and relates to a seat surface sealing gauge comprising: a base and a limit assembly disposed on the upper side of the base for pressing a common rail valve body, wherein an accommodating groove for the embedment of the lower end of the valve seat is defined on the base, an air inlet passage communicating with the accommodating groove is defined on the side wall of the base, an air outlet joint is disposed in the second flow passage on the valve seat, and one end of the air outlet joint away from the valve seat is provided with an air measurement assembly. The seat surface sealing gauge has the following effects that air moves between the slope of the lower end of the valve stem and the slope of the bottom of the slot, and the air measuring assembly located at the air outlet joint detects whether there is air venting at the air outlet joint to determine whether there is a gap between the two slopes, therebydetecting the tightness between the valve stem and the bottom of the plug-in slot.

Description

technical field [0001] The invention relates to the technical field of valve stem testing equipment, in particular to a seat surface sealing test tool and a use method. Background technique [0002] The common rail system of diesel engine is a high-pressure injection fuel supply technology for diesel engines that emerged in the 1990s abroad. A method of supplying oil in which the production and injection processes are completely separated from each other. It uses a high-pressure oil pump to deliver high-pressure fuel to the public fuel supply pipe, and realizes precise control through the oil pressure in the public fuel supply pipe, so that the pressure of the high-pressure fuel pipe has nothing to do with the engine speed, which can greatly reduce the fuel supply pressure of the diesel engine. degree of change. [0003] Generally, there will be a common rail valve body in the common rail system, refer to figure 1 , comprising a valve seat 310 and a valve stem 320, the lo...

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Problems solved by technology

[0004] During use, the tightness of the common rail valve body has a great influence on the two flow states of the oil. In the first flow state, the contact surface between the piston and the inner wall of the mating groove is the sealing surface, the sealing surface area is large, and the sealing performance is high. Better, but in the second flow state, the contact surface between the slope at the lower end of the valve stem and the slope at the bottom of the slot is the sealing surface, the sealing area is small, and the oil may leak into the second flow channel, so now There is an urgent need for inspection tools that can detect the tightness of common rail valve bodies

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