AT9718U1 - BLIND COUPLING WITH CHECK VALVE - Google Patents

Description

2 AT 009 718 U1

The invention relates to a dummy coupling, which closes axially, is compatible with a symmetrical hose coupling of two coupling halves, each consisting of a hose nozzle and a rotatably mounted on the hose nozzle collar ring, or is compatible with the form of a one-piece hard coupling, comprising a blind cover with a vor-5 preferably centrally arranged peg-shaped extension. Alternatively, in this type of coupling, one half may be made in one piece as a so-called fixed coupling, which is why the dummy coupling in its two-part form is also compatible therewith.

Blind couplings are known, for example, from the fire department. They are compatible to hose couplings, the symmetrical coupling halves have Knaggenringe, which are rotatable relative to each half associated hose nozzle and the catches can be brought bayonet-like manner with a slope having strips of Knaggenringes the other coupling half. The rotation of the Knaggenringe causes an axial approach of the Schlachstutzen, so that in the end face 15 arranged sealing rings are axially pressed against each other without mutual rotation. Compatible with the hose coupling solid coupling combines not only the force transmitting elements lugs and strips and the sealing ring in the one-piece coupling form and ensures with a rotatable Knaggenring the counter-coupling the principle of operation. The blind coupling is a variant of the Schlachkupplung, wherein the hose nozzle is replaced by a 20 clutch side identical formed blind cover with closed bottom. Blanking couplings are used to close unneeded line connections or only as a protective element on non-pressurized lines.

Such known as system "Storz" long and standardized in terms of connection dimensions and Ausfüh- 25 tion requirements, for example, in DIN 14301 et seq. Couplings include blind couplings for above-mentioned applications in the form that for sealing mainly water leading lines seals for pressure and / or suction operation, or that control holes with a diameter of approximately 4 mm, drilled into the bottom of the cover for the protection of dry lines, prevent pressure from building up in the pipeline or indicate such in the event of accidental valve opening so as not to endanger the operator. However, there are also situations in practice where, although not simultaneously, the dummy coupling should advantageously be able to perform both of the functions described, e.g. as a protective element on the hard coupling at the outlet of a check valve used on the pressure side of a fire pump, which in turn 35 must be tested in certain cycles on their Ansaugauglichkeit, in the case of a leak at the valve, the dummy coupling takes over the hermetic seal.

From DE 195 38 118 A1 discloses a cover unit is known, which yields during pressurization and bulges. In order to prevent flying away, a collecting unit is provided. As a result, this dummy coupling is disadvantageously no longer usable after the occurrence of an overpressure and can not be used at all in the event of evacuation.

From DE 35 01 741 A, a blind coupling is known which expressly allows a pressure build-up, which is reduced only upon release of the blind cover before the blind cover abgenom-45 men can be.

From US-PS 2,636,634 still a generic type pressure vessel with valve is known, which closes stronger by the pressure inside the container and can be forcibly opened by force from the outside on the valve stem. 50

The invention has for its object to provide a dummy coupling of the initially mentioned type, which avoided in the closed line through a pressure build-up or at least recognizable displayed, and vacuum tightness is ensured. The solution to this problem is stated in the claims.

Claims (5)

Exemplary embodiments of the invention are illustrated and explained below with reference to the drawings. FIG. 1 shows a blind coupling comprising a collar ring and a blind cover; FIG. FIG. 2 shows a positive fixing of the position of the check valve by means of a stepped bore; FIG. 3 shows a positive fixing of the position of the non-return valve by means of a securing ring; and FIG. 10 shows a positive fixing of the position of the non-return valve by means of a threaded ring. The blind coupling shown in Fig. 1 consists of a Knaggenring 1 with the force-transmitting elements lugs 2 and strips 3, which is rotatably mounted on a blind cover 4, wherein a shoulder 5 on a collar 6 of the blind cover 4 in the coupled state 15 by system internal pressure or only by pressing a sealing ring 7 occurring force on the Knaggenring 1 transmits and in the force-free opposite direction in a groove 8 of the blind cover 4 mounted retaining ring 9 holds the blind cover 4 in position. The blind cover 4 also includes an end face a plan recess 10 with a background rotation 11 for receiving the profiled and suitable for pressure and suction sealing ring 7, the 20 vacuum capability is justified in a lying on the outer periphery of the suction lip 12. The basic function of the blind cover 4 determines a closed base 13, which is often curved for reasons of strength, to which a pin-shaped extension 14 with a radial recess 15 as a so-called "button 16" allows the attachment of a retaining chain 17, being arranged centrally. This Radialeinstich 15 and the length of a line-25 system facing the inner lid 18 and a mostly dome-shaped knob end 19 are decisive for a central bore 20 and the size of a check valve 21 to be installed there preferably. The check valve 21 in a size of about 6 mm nominal diameter opens at low (st) em pressure 30 in the closed line, but can in case of accidental opening of an upstream shut-off valve in e.g. a line with a nominal diameter of 65 mm by the low Absteuermenge pressure build-up not prevent, so that, however, a positive positional fixation for the check valve 21 is necessary. 2 in the form of a stepped bore 22, alternatively with the aid of additional elements such as a safety ring 23 (see FIG. 3) or a threaded ring 24 (see FIG. 4). If a vacuum is to be maintained in the line, e.g. due to leakage at Absperrven-40 til draws to the dummy coupling, the check valve 21 blocks the central bore 20 via a valve seat 25 and an O-ring on the circumference 26 hermetically, while the coupling connection through the pressure / suction sealing ring 7 withstands. In this case, the suppression tries to pull the check valve 21 into the line, which is why - due to the relatively small force - an axial securing with little effort such. a deforma tion of a bore edge 27 with grain impact or a similar caulking is sufficient. Claims 1. 50. Axial close dummy coupling compatible with a symmetrical hose coupling of two coupling halves each consisting of a hose stub and a collar ring (1) rotatably mounted on the hose stub, or compatible with the form of a one-piece solid coupling a blind cover (4) with a preferably centrally located peg-shaped extension (14), characterized in that the peg-shaped extension has a through bore (20) in the axial direction, in which a check valve (21) is received , 2. Dummy coupling according to claim 1, characterized in that the check valve (21) 5 allows the flow direction from the inside of the blind cover (4) to the outside and seals the flow in the opposite direction. 3. Dummy coupling according to claim 1 or 2, characterized in that the pin-like extension (14) on the blind cover (4) is arranged lying outside. 10 4. Dummy coupling according to one of claims 1 to 3, characterized in that the check valve (21) in the bore (20) on the outside via a shoulder in the form of a drill step (22) or by means of an additional element such as a locking ring (23) or a threaded ring (24) is axially positively secured against occurring compressive forces. 15 5. Dummy coupling according to claim 4, characterized in that the check valve (21) is secured on the inside against the forces of the vacuum by deformation of the bore edge (27) by means of grain impact or other caulking tool. 20 For 2 sheets of drawings 25 30 35 40 45 50 55