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Spray gun with improved needle type cut-off valve sealing device

A closed position, injection device technology, applied in the direction of injection device, injection device, liquid injection device, etc., can solve the problems of time-consuming and expensive

Inactive Publication Date: 2008-11-05
SPRAYING SYST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This can be especially costly and time consuming when a large number of nozzle assemblies need to be maintained, as is common in many machining operations
[0005] Another problem in the field maintenance of existing nozzle assemblies is inventory, that is, the number of orifice parts of different specifications and sizes that must be supplied by the manufacturer and stored by the user

Method used

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  • Spray gun with improved needle type cut-off valve sealing device
  • Spray gun with improved needle type cut-off valve sealing device
  • Spray gun with improved needle type cut-off valve sealing device

Examples

Experimental program
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Embodiment Construction

[0022] Referring now in more detail to the drawings, there is shown a spraying device 10 comprising a spray gun 11 having a nozzle assembly 12 in accordance with the present invention. The basic structure and manner of operation of the spray gun 11 is known in the art, for example as shown in the aforementioned US Patent 5,707,010, which is incorporated herein by reference. The overall structure and manner of operation of the spray gun 11 is to be understood as merely illustrative of one example of a spray device employing the nozzle assembly of the present invention.

[0023] The illustrated spray gun 11 comprises a main housing 14 axially supporting a shut-off valve needle 15 and having a fluid inlet 16 connected to a source of fluid to be sprayed and an auxiliary fluid inlet 18 connected, for example, to a source of compressed air, In order to assist in the atomization of the fluid to be sprayed, and to allow the controlled axial movement of the valve needle 15 between the ...

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PUM

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Abstract

A gun-like spray device (10) has a spray nozzle assembly (12) at the discharge end and a reciprocatably movable valve needle (15) for controlling the liquid flow through the discharge nozzle assembly. The nozzle assembly (12) includes an orifice member (46) which defines a liquid discharge orifice (61) and a rigid valve seat (70) for centering and precisely locating the valve needle (15) in a closed position. An annular resilient sealing member (78) is secured within the orifice member (46) for engaging and creating a liquid seal about the valve needle (15) separate and apart from the rigid seat (70) when the valve needle (15) is in a closed position. The spray nozzle assembly may be used with spray devices having different sized valve needles and includes a first rigid valve seat (70) downstream of the resilient sealing member (78) for receiving a relatively small diameter valve needle and a second rigid valve seat upstream (88) of the resilient sealing member (78) for receiving a relatively large diameter valve needle.

Description

technical field [0001] The present invention relates generally to nozzle assemblies, and more particularly to a spray gun having a nozzle assembly at a discharge end and a reciprocable valve needle that controls the discharge of fluid from the nozzle assembly. Background technique [0002] Spray guns having reciprocally operated needle shut-off valves are well known in the art, such as shown in US Patent 5,707,010, assigned to the assignee of the present invention. The nozzle assembly of such a spray gun includes an orifice forming member or slug, referred to herein as an orifice, which forms a discharge port and a conical valve seat for a control valve needle reciprocatable on a liquid flow passage, thereby The flow of fluid can be controlled through the nozzle assembly. Metallic contact is made between the needle of the orifice and the tapered valve seat when the valve is closed, the seat is positioned concentrically with the needle and blocks the needle and shuts off the...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B05B1/30B05B7/06B05B15/02B05B15/00B05B1/32B05B7/08B05B7/12
CPCB05B7/0815B05B7/1254B05B7/066Y10S239/04B05B1/306B05B15/0233B05B7/1272B05B15/5225
Inventor J·哈鲁奇G·P·费拉扎
Owner SPRAYING SYST
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