FR2686675A1 - DETENDER VALVE FOR PAINT GUN. - Google Patents

Abstract

The subject of the invention is a pressure reducing valve. Regulator valve of the type whose section of said valve is triangular and inscribed in a circle, the three generatrices of the circle act as guiding means of the valve in its housing, characterized by the fact that the head (8) is spherical and that the body (9) is extended by three identical equidistant plates which ensure a large passage of air. Regulator valve for paint gun.

Description

The invention relates to a valve regulator for a gun

painting.

  The state of the art can be defined by the following patents: -FR-A-2 194 135: Spray gun, characterized in that the compressed air inlet in the channel of the handle is via a nozzle forming with the internal walls of said channel, a Venturi in which secondary air taken outside in the ambient atmosphere, arrives through orifices formed in the

Venturi around said nozzle.

  In the internal channel of the nozzle, is disposed, free sliding, a valve connected by a rod to the lever system actuated by the trigger by means of a return spring, so that the valve, normally closing the passage compressed air in the nozzle, opens this passage

when you press on the trigger.

  -FR-A-2 259 644: Automatic painting gun for industrial use, operating at low pressure, characterized in that it comprises two compressed air inflow, a compressed air supply called control and a arrival of compressed air called spraying, a piston mounted on the spindle of the spout nozzle whose displacement is actuated by the arrival of the compressed air said control and by a return spring disposed in the piston chamber, the displacement said piston allowing opening and closing firstly of said needle of the spray nozzle and secondly of the passage of the so-called compressed air, opening at the level of the piston rod, the so-called compressed air of spray then going through a nozzle of injection, in a Venturi horn, composed of a convergent cone and a divergent cone connected by a connecting channel and a means for the intake of secondary air taken outside in the at ambient mosphere, so as to bring back the air

  spraying from high pressure to low pressure.

  In FR-A-2 194 135, the seal is provided at the valve by a valve seal which is arranged in a groove provided for this purpose between the top of the valve and the valve stem. In fact, the air removes the rubber seal at the passage creating

  thus sealing problems.

  The seal can be glued into the throat of the valve stem, but gradually to use, said seal is detached and no longer ensures tightness. For this purpose, the regulator valve according to the invention is of the type of which the section of said valve is triangular and inscribed in a circle, the three generatrices of the circle act as guide means for the valve in its housing, said valve is characterized by the fact that the head is spherical and that the body is extended by three equidistant identical dishes that ensure

a big passage of the air.

  According to another embodiment, the three equidistant identical plates, formed on the body of the valve, are each provided with a frustoconical recess which increases the passage of air. The attached drawings are given as indicative and nonlimiting examples. They represent a preferred embodiment according to the invention.

easily understand the invention.

  FIG. 1 is a side view of the valve according to the state of the

technical.

  Figure 2 is a view of the valve according to Figure 1 seen from the front. FIG. 3 is a side view of the valve according to the invention

  highlighting the spherical head.

  FIG. 4 is a front view of the valve according to FIG.

  FIG. 5 is a side view of another embodiment of the valve according to the invention, showing the recesses

provided at the level of the dishes.

  FIG. 6 is a view of the rear face of the flap seen according to

F shown in Figure 5.

  FIG. 7 is a cross-sectional view according to the section

M-M shown in Figure 5.

  FIG. 8 is a cross-sectional view according to the section

N-N shown in Figure 5.

  FIG. 9 is a schematic view making it possible to visualize in a dotted circle the position of the check valve

  regulator applied to a spray gun.

  FIG. 10 is a detailed view of the valve according to the state of the art, it highlights in particular the O-ring which

ensures tightness.

  FIG. 11 is a detailed view of the valve according to the invention, it highlights in particular the spherical head of the

  valve and the recesses on the flat parts.

  FIG. 12 is an end view on the upstream side of the check valve

  relaxation set up in the Venturi.

  FIG. 13 is a longitudinal sectional view of the check valve

  relaxation set up in the Venturi.

  The valve 1 as shown in FIGS. 1, 2 and 10 comprises an O-ring 3 which seals the seal. This valve 1 is of the type whose section is triangular and is inscribed.

in a circle.

  The three generators of the circle serve as means of

  guiding the valve 1 in its housing 4.

  The valve 1 is provided, at its head 2 and the rod 7, which is conical, a groove 5 which allows to receive the seal

toric 3.

  The valve 6 according to the invention is characterized in that the head 8 is spherical The spherical head 8 is extended by the body 9 of the valve 6 which comprises three identical plates 10, 11, 12

  and equidistant and which ensure a large passage of air.

  According to another embodiment shown in Figures 6, 7 and 8, the three identical plates 10, 11, 12 are each provided with a recess 13 of frustoconical shape which increases the

passage of the air.

REFERENCES

  1. 2. 3. 4. 5. 6. 7. 8. 9., 13. Valve Valve head O-ring Housing Throat Valve Valve stem Spherical head Valve body 6 11, 12 Plates Recess

Claims (2)

  1 valve of the type of which the section of said valve (1) is triangular and inscribed in a circle, the three generatrices of the circle act as guiding means of the valve (1) in its housing (4), characterized in that the head (8) is spherical and the body (9) is extended by three equidistant identical plates (10, 11, 12) which ensure a big passage of the air.   2 valve according to claim 1 characterized in that the three plates (10, 11, 12) equidistant identical, formed on the body (9) of the valve (6), are each provided with a recess (13) of frustoconical shape that increases the passage of air.