The method of repair of pressure relief valves tractor hydraulic distributors


(57) Abstract:

Usage: repair production, restoration of the bypass valve and increase their post-repair resource. The inventive valve seat rastaivaya without removing internal hole on the greater repair, cylinder valve, the tapered bolt is cut to education cylindrical surface on which zapressovyvajut sleeve with a radial drain channels. The sleeve is polished under the hole of the valve seat providing minimum clearance for connection and fixed to the valve by means of radially arranged pin and piston portion of the valve grind under repair size, and the orifice install the cover. 4 Il.

The invention relates to the repair of production and can be used for recovery relief valves and enhance their post-repair resource.

The known method of repair-pass valve comprising processing conical surface at an angle of 45aboutcutter on a lathe and grinding at the same angle, the expansion piston part staliunas or plating, followed slim method provided by the recovery of the by-pass valve with a relatively small wear cone-pass valve. In practice, however, found that at least half of the valves are conical part of a significant deterioration of the above-mentioned method cannot be localized and there is a need welding cone and machining after welding. These operations are time consuming and in most cases are not met, the valve is simply written off the scrap heap and replaced by a spare new one.

Restoring piston part connected with staliunas or chrome also has considerable complexity.

Low technical level repair production can not withstand the technical requirements on the repaired valve (for example, the alignment cone and piston parts), which leads to the decrease of the technical characteristics of the dispenser, namely, to reduce the volumetric efficiency of the distributor (increased leakage through the valve when it is closed), and hence the performance of the tractor unit. In terms of repair and production operations plating and cladding have certain difficulties in the application of these methods and disposal of waste and related environmental phenomena of nature. Processing normirovannih paratene is to provide a method of repair of pressure relief valves tractor valves, you can reduce the complexity of the repair, improve manufacturability recovery to significantly improve post-repair resource tractor hydraulic distributors.

The invention differs in that the valve seat rastaivaya without removing internal hole on the greater repair, cylinder valve, the tapered bolt is cut to education cylindrical surface on which zapressovyvajut sleeve with a radial drain channels, then the sleeve is polished under the hole of the valve seat providing minimum clearance for connection and fixed to the valve by means of radially arranged pin and piston portion of the valve grind under repair size, and the orifice install the door.

The use of the invention eliminates many of the technological operation to restore the bypass valve, which is required when the conventional method of repair. There is no need in the description silnosolenyh valves, since the proposed method all valves can be repaired. There is no need to ipressive saddle. Install the bushings on the modified tapered shank and fitting it under the seat diameter is not raheemah with stationary parts of the valve seats from three to two, that allows the valve to better centered. Thus, a new set of features of the proposed method allows to obtain a new technical result, which cannot be obtained by the known method. The invention can be used not only for major overhaul of valves, but when the current in the conditions of the rural Studio.

The invention is illustrated by the following drawings for example tractor valve P80-3/1-222.

Fig.1 is a schematic illustration of the geometric shape of the valve repair; Fig. 2 is a schematic illustration of the geometric shape of the valve after repair; Fig. 3 is a schematic illustration of the geometric shape of the sleeve with a radial channels; Fig.4 is a schematic representation of the relief valve Assembly after repair.

The proposed method is implemented as follows.

In case 1 (Fig.4) of the valve handle, for example, the saddle 2 hole 3 more repair size (for example 20 mm). Head 4 by-pass valve 5 (see Fig.1) cut off the shank 6 to the formation of the cylindrical surface 7 (see Fig.2), which is zapressovyvajut sleeve 8 (see Fig.3) with radial drain channels 9. The property is by a pin 11 fixed to the sleeve 8 on the valve 5, when the pin 11 serves to stop movement of the bypass valve 5 down to close the radial drain channels 9 body seat 2. Piston part 12 by-pass valve 5 grinding diameter underestimate 0.05...0.1 mm and the orifice 13 choke rivet 14 (see Fig.4).

The METHOD of repair of pressure RELIEF VALVES TRACTOR hydraulic distributors, including machining the valve seat, the valve head with the tapered bolt and piston parts, characterized in that the valve seat stretch without removing internal hole on the greater repair, cylinder valve, the tapered bolt is cut to education cylindrical facets which zapressovyvajut sleeve with a radial drain channels, then the sleeve is polished under the hole of the valve seat providing minimum clearance for connection and fixed to the valve by means of radially arranged pin and piston portion of the valve grind under repair size, and the orifice install the cover.


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