Connection fitting for a valve coupling and/or test coupling for fluid systems for detecting fluid pressures and for filling, emptying and venting fluid systems

1. A connection fitting ( 102 ) for detecting operating pressures of fluid media, comprising:

an opening pin ( 114 ) with a substantially circular, closed contact surface for a spring-loaded and mechanically actuatable non-return valve ( 32 ), said valve ( 32 ) having a valve body ( 18 ) that is supported on a valve seat ( 52 ) when in a non-actuated state, said valve ( 32 ) being arranged in a drilled hole ( 10 ) of a connecting part ( 16 ) of a coupling bushing ( 6 ) which is under operating pressure,

wherein the opening pin ( 114 ) has at least one passage hole ( 118 ) which runs laterally to the contact surface and through which a connection between the connection fitting ( 102 ) and a valve coupling or measuring coupling ( 2 ) for fluid systems can be established;

wherein the connection fitting ( 102 ) is configured to be screwed onto a connecting part ( 16 ) of the valve coupling or measuring coupling ( 2 ),

wherein the valve coupling or measuring coupling ( 2 ) comprises a sealing ring ( 50 ) that is arranged in a groove ( 44 ) of the valve body ( 18 ), and

wherein the groove ( 44 ) has a trapezoidal cross section that tapers in the radial direction.

2. The connection fitting ( 102 ) according to claim 1 , wherein there are between two and four passage holes ( 118 ) in the opening pin ( 114 ).

3. The connection fitting ( 102 ) according to claim 2 , wherein, as seen from the contact surface in the direction of the valve body ( 18 ), the passage holes ( 118 ) run conically towards the outside.

4. The connection fitting ( 102 ) according to claim 1 , further comprising a support collar ( 110 ) to support a support bushing ( 20 ) of the valve coupling and/or measuring coupling ( 2 ).

5. The connection fitting ( 102 ) according to claim 1 , further comprising a buttress internal thread ( 106 ) to receive a buttress external thread ( 90 ) of the connecting part ( 16 ) of the valve coupling and/or measuring coupling ( 2 ).

6. A fluid connection ( 100 ), comprising:

a connection fitting ( 102 ) having an opening pin ( 114 ) with a substantially circular, closed contact surface for a spring-loaded and mechanically actuatable non-return valve ( 32 ), and having at least one passage hole ( 118 ) which runs laterally to the contact surface; and

a valve coupling and/or measuring coupling ( 2 ) for fluid systems for purposes of detecting operating pressures of fluid media, comprising a coupling bushing ( 6 ) that has a connecting part ( 16 ) and that is under operating pressure in the installed state, and with a drilled hole ( 10 ) in which the spring-loaded and mechanically actuatable non-return valve ( 32 ) is arranged whose valve body ( 18 ) is supported on a valve seat ( 52 ) when in the non-actuated state, and which can be contacted by the contact surface of the opening pin ( 114 ),

wherein the connection fitting ( 102 ) is configured to be screwed onto the connecting part ( 16 ) of the valve coupling and/or measuring coupling ( 2 ),

wherein the valve coupling and/or measuring coupling ( 2 ) comprises a sealing ring ( 50 ) that is arranged in a groove ( 44 ) of the valve body ( 18 ), and

wherein the groove ( 44 ) has a trapezoidal cross section that tapers in the radial direction.

7. The fluid connection ( 100 ) according to claim 6 , wherein the valve seat ( 52 ) is configured integrally in the coupling bushing ( 6 ) or alternatively secured in the coupling bushing ( 6 ).

8. The fluid connection ( 100 ) according to claim 6 wherein the valve seat ( 52 ) has an inner contour ( 68 ) with a first section ( 70 ) that runs parallel to the axial direction of the drilled hole ( 10 ), and a second section ( 74 ) that tapers in the direction of the coupling bushing, and wherein an outer contour ( 80 ) of the valve body ( 18 ) is configured in certain areas so as to have a shape that is congruent with the two sections ( 70 , 74 ).

9. The fluid connection ( 100 ) according to claim 6 , wherein, when the valve is closed, the sealing ring ( 50 ) does not sit completely in the part of the drilled hole that constitutes a section of the valve seat ( 52 ).

10. The fluid connection ( 100 ) according to claim 6 , wherein the valve body ( 18 ) is structured in two parts, namely, a receiving part ( 22 ) and an insertion part ( 26 ), and wherein the receiving part ( 22 ) has a blind hole ( 38 ) that receives a peg ( 34 ) of the insertion part ( 26 ), and wherein the trapezoidal groove ( 44 ) for the sealing ring ( 50 ) is formed between a collar ( 40 ) of the insertion part ( 26 ) and a collar ( 30 ) of the receiving part ( 22 ).

11. The fluid connection ( 100 ) according to claim 6 , wherein the connecting part ( 16 ) has an external thread ( 90 ) that is configured in the form of external buttress gearing, and wherein the connection fitting ( 102 ) comprises a buttress internal thread ( 106 ) to receive the buttress external thread ( 90 ) of the connecting part ( 16 ) of the valve coupling and/or measuring coupling ( 2 ).

12. A fluid connection, comprising:

a connection fitting having an opening pin with a substantially circular, closed contact surface for a spring-loaded and mechanically actuatable non-return valve, and having at least one passage hole which runs laterally to the contact surface; and

a valve coupling comprising a coupling bushing that has a connecting part,

wherein said coupling bushing has a drilled hole in which the spring-loaded and mechanically actuatable non-return valve is arranged whose valve body is supported on a valve seat when in the non-actuated state, and which can be contacted by the contact surface of the opening pin,

wherein the valve body has a receiving part and an insertion part,

wherein the receiving part has a blind hole that receives a peg of the insertion part,

wherein a groove for a sealing ring has a trapezoidal cross section that tapers in the radial direction, with said groove being formed between a collar of the insertion part and a collar of the receiving part, and

wherein the connection fitting is configured to be screwed onto the connecting part of the valve coupling.