CZ287231B6 - Strain gauge pressure reducing valve - Google Patents

Abstract

The invented pressure-reducing valve comprises a membrane having the form of a resilient tube (4) with attached faces (5, 6). On the tube (4) there lie in longitudinal direction thin plates (7) anchored in the tube (4) faces (5, 6) and controlling a cone (9) with respect to a throttling mechanism seat.

Description

Strain gauge pressure reducing valve

Technical field

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pressure reducing valve for regulating gas pressure, in particular for self-contained breathing apparatus with fixed secondary pressure adjustment.

BACKGROUND OF THE INVENTION

The existing gas pressure reducing valves are mainly membrane and piston valves.

They are manufactured by intensive machining of forgings. The diaphragm valves are controlled using adjustable springs with the necessary screw connections and seals. The parts require precise machining, large diameter fittings, and are generally very massive.

SUMMARY OF THE INVENTION

These drawbacks are largely overcome by a strain gauge pressure regulating valve for gas pressure control, which comprises a flexible tube-shaped diaphragm with attached faces on which longitudinally lies the blades anchored in the ends of the tube and operating the plug against the throttle seat.

Its advantage is low weight, relatively low production, minimal number of parts, does not require heavy forgings and their demanding machining, allows easy adjustment by one element without further mechanical operations, in practice it provides almost constant static secondary pressure in the whole range of primary pressure input values.

Overview of the drawings

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 shows the valve in the rest position; FIG. 2 shows a cross section of the valve in the rest position; FIG. 3 shows the operating position of the valve of FIG. 5 shows an example of a practical arrangement of a strain gauge valve.

DETAILED DESCRIPTION OF THE INVENTION

The strain gauge pressure reducing valve comprises a base body 1 provided with an inlet connection 2 or a connection for a signaling device and a pressure gauge for measuring the pressure in the primary space. Part of the basic body is a throttle seat separating the primary and secondary space. The base body 1 is further provided with an outlet screw 3 for evacuating the reduced pressure gas from the secondary space for the second stage, optionally with a further screw connection for an auxiliary device and a safety valve. A strain gauge system, which consists of a diaphragm in the form of a flexible tube 4 with an internal cavity and a circular, rectangular or polygonal surface, made, for example, of silicone rubber connected at one end by a clamp or preferably by vulcanization, a connecting face 5, provided with a screw connection for connection to the base body 1 and at the other end with a closing face 6, and from the foils 7 mounted longitudinally on the surface of the flexible tube 4 which are anchored on one side in a circular cavity of the base body 1 connection face 5. In order to increase the working pressure range, it is possible to insert further blades 7 into the resulting sector of the faces 5 and 6 in the closing face 6.

Throttle mechanism. Against accidental mechanical damage of the system due to excessive overpressure, it is inserted into a protective tube 10, which by its inner wall forms a stop for bearing the foils 7 and defines the maximum deformation of the flexible tube 4.

The function of the strain gauge pressure reducing valve is to expand the diaphragm in the form of a flexible tube 4 which increases the volume when the medium pressure is applied, the blades 7 firmly anchored in the ends 5 and 6 at both ends of the flexible tube 4 lying longitudinally on its surface. the flexible tubes 4 and by means of a plug 9 abutting the seat in the base body 1 close the inlet of the primary pressure into the secondary space in the firmly connected base body L

The strain gauge pressure reducing valve is particularly useful in the field of breathing technology, where insulating breathing apparatuses are mainly two-stage. The first stage reduces the air pressure from the container, for example from 30 MPa to 0.5 MPa, and the connected second stage extracts air from the user.

Claims (1)

Strain gauge pressure control valve for gas pressure regulation, characterized in that it comprises a diaphragm in the form of a flexible tube (4) with connected faces (5, 6), on which longitudinally lying foils (7), anchored in the faces (5, 6) a tube (4) and operating the plug (9) against the throttle seat.