Valve

1. A valve comprising:

a housing ( 1 );

a solenoid ( 5 ) arranged in the housing ( 1 );

a pin ( 7 ) movable by the solenoid ( 5 );

a piston ( 8 ) connected to the pin ( 7 ), the piston ( 8 ) having a crown region including a crown ( 12 ); and

a seal ( 14 ) arranged in the crown region of the piston ( 8 ), the seal ( 14 ) having a sealing surface ( 15 ),

wherein the piston ( 8 ) is made of metal and the seal ( 14 ) is made of a different material than the piston ( 8 ),

wherein the seal ( 14 ) is of annular form and, on its side facing away from the sealing surface ( 15 ), has 3 to 12 integral moldings ( 22 ), each of which extends through a respective one of plural apertures ( 23 ) arranged in the crown ( 12 ) of the piston ( 8 ), and

wherein the seal ( 14 ) includes a main body ( 21 ) and the integral moldings ( 22 ), the integral moldings each have a recess ( 27 ), and the crown ( 12 ) has plural tabs ( 28 ), each of which is configured to be bent in a first direction, to allow insertion of the seal ( 14 ), and then be bent in a second direction to engage a respective one of the recesses ( 27 ) of the inserted seal ( 14 ).

2. The valve as claimed in claim 1 , wherein the piston ( 8 ) is made of high-grade steel.

3. The valve as claimed in claim 1 , wherein the seal ( 14 ) comprises an Ethylene Propylene Diene Monomer (EPDM) rubber, or a Polyphthalamide (PPA) plastic.

4. A valve comprising:

a housing ( 1 );

a solenoid ( 5 ) arranged in the housing ( 1 );

a pin ( 7 ) movable by the solenoid ( 5 );

a piston ( 8 ) connected to the pin ( 7 ), the piston ( 8 ) having a crown region including a crown ( 12 ); and

a seal ( 14 ) arranged in the crown region of the piston ( 8 ), the seal ( 14 ) having a sealing surface ( 15 ),

wherein the piston ( 8 ) is made of metal and the seal ( 14 ) is made of a different material than the piston ( 8 ),

wherein the seal ( 14 ) comprises an Ethylene Propylene Diene Monomer (EPDM) rubber, or a Polyphthalamide (PPA) plastic,

wherein the seal ( 14 ) is of annular form and, on its side facing away from the sealing surface ( 15 ), has 3 to 12 integral moldings ( 22 ), each of which extends through a respective one of plural apertures ( 23 ) arranged in the crown ( 12 ) of the piston ( 8 ), and

wherein the integral moldings ( 22 ) have, at their free end, a material accumulation ( 29 ) forming an undercut with respect to the respective apertures ( 23 ), the material accumulation ( 29 ) being generatable during production of the seal ( 14 ) or by retroactive hot calking.

5. The valve as claimed in claim 1 , wherein the main body ( 21 ) has a thickness of at least one selected from the group of: 0.5 mm to 10 mm and 1 mm to 5 mm.

6. The valve as claimed in claim 1 , wherein the piston ( 8 ) is welded to the crown ( 12 ).

7. The valve as claimed in claim 1 , wherein the metal of the piston ( 8 ) has a thickness of at least one selected from the group of: 0.3 mm to 0.8 mm, 0.4 mm to 0.6 mm and 0.5 mm.

8. The valve as claimed in claim 2 , wherein the high-grade steel is a chromium-nickel steel.