Fluid meter with pressure protection

1. A fluid meter, comprising:

housing walls defining a measurement volume and comprising,

an inlet to connect said measurement volume to a fuel reservoir,

an outlet to connect said measurement volume to a fuel dispensing hose, and

an elastically displaceable wall portion in said housing walls arranged to be elastically displaced in response to a pressure variation propagating into said measurement volume through said inlet or outlet.

2. A fluid meter according to claim 1 , wherein said wall portion is elastically displaceable by elastic deformation.

3. A fluid meter according to claim 1 , wherein said housing walls comprise more than one of said elastically displaceable wall portions.

4. A fluid meter according to claim 1 , wherein said fluid meter further comprises a measuring device arranged in said measurement volume, and said measuring device comprises a piston type fluid meter.

5. A fluid meter according to claim 1 , wherein the measurement volume comprises at least one sub volume with a cylindrical section.

6. A fluid meter according to claim 5 , wherein said elastically displaceable wall portions define an end surface of said cylindrical section.

7. A fluid meter according to claim 5 , wherein said sub volume further comprises a non-cylindrical section, and wherein said elastically displaceable wall portion for a part of the housing walls defines said non-cylindrical section.

8. A fluid meter according to according to claim 1 , wherein the pressure variation is a pressure peak.

9. A fluid meter according to claim 1 , wherein said elastically displaceable wall portion is arranged to be elastically displaced only when subjected to a pressure transient with a pressure variation of more than 1 bar.

10. A fluid meter according to claim 1 , wherein said elastically displaceable wall portion is replaceably attached to said housing.

11. A fluid meter according to claim 1 , wherein said elastically displaceable wall portion is supported by a frame member.

12. A fluid meter according to claim 1 , wherein said elastically displaceable wall portion is made of a material selected from the group consisting of: rubber, spring steel, plastic, and metal.

13. A fluid meter according to claim 1 , wherein said housing walls comprise two spaced apart wall sections interconnected with said elastically displaceable wall portion.

14. A fuel dispenser, comprising:

a fluid meter comprising:

a housing comprising housing walls defining a measurement volume,

an inlet to connect said measurement volume to a fuel reservoir,

an outlet to connect said measurement volume to a fuel dispensing hose,

wherein said housing walls comprise an elastically displaceable wall portion arranged to be elastically displaced in response to a pressure variation propagating into said measurement volume through said inlet or outlet.

15. A fuel dispenser according to claim 14 , wherein said elastically displaceable wall portion is elastically displaceable by elastic deformation.

16. A fuel dispenser according to claim 14 , wherein said housing walls comprise more than one said elastically displaceable wall portion.

17. A fuel dispenser according to claim 14 , further comprising a measuring device arranged in said measurement volume, wherein said measuring device is a piston type fluid meter.

18. A fuel dispenser according to claim 14 , wherein the volume comprises at least one sub volume with a cylindrical section.

19. A fuel dispenser according to according to claim 14 , wherein the pressure variation is a pressure peak.

20. A fuel dispenser according to claim 14 , wherein said elastically displaceable wall portion is arranged to be elastically displaced only when subjected to a pressure transient with a pressure variation of more than 1 bar.

21. A fluid meter, comprising:

a housing comprising walls defining a measurement volume, wherein the volume comprises at least one sub volume with a cylindrical section, and wherein said sub volume further comprises a non-cylindrical section,

an inlet to connect said measurement volume to a fuel reservoir, and

an outlet to connect said measurement volume to a fuel dispensing hose,

wherein said walls comprise an elastically displaceable wall portion arranged to be elastically displaced in response to a pressure variation propagating into said measurement volume through said inlet or outlet, wherein said wall portion for a part of the walls defines said non-cylindrical section.

22. A fluid meter, comprising:

a housing comprising walls defining a measurement volume,

an inlet to connect said measurement volume to a fuel reservoir, and

an outlet to connect said measurement volume to a fuel dispensing hose,

wherein said walls comprise an elastically displaceable wall portion arranged to be elastically displaced in response to a pressure variation propagating into said measurement volume through said inlet or outlet, wherein said wall portion is replaceably attached to said housing.

23. A fuel dispenser, comprising:

a fluid meter comprising;

a housing comprising walls defining a measurement volume, wherein the volume comprises at least one sub volume with a cylindrical section,

an inlet to connect said measurement volume to a fuel reservoir, and

an outlet to connect said measurement volume to a fuel dispensing hose,

wherein said walls comprise an elastically displaceable wall portion arranged to be elastically displaced in response to a pressure variation propagating into said measurement volume through said inlet or outlet, wherein said sub volume further comprises a non-cylindrical section, and wherein said wall portion for a part of the walls defines said non-cylindrical section.

24. A fuel dispenser, comprising:

a fluid meter comprising;

a housing comprising walls defining a measurement volume,

an inlet to connect said measurement volume to a fuel reservoir, and

an outlet to connect said measurement volume to a fuel dispensing hose,

wherein said walls comprise an elastically displaceable wall portion arranged to be elastically displaced in response to a pressure variation propagating into said measurement volume through said inlet or outlet, wherein said wall portion is replaceably attached to said housing.

25. A fluid meter according to claim 1 , further comprising a measuring device arranged in said measurement volume.

26. A fuel dispense according to claim 14 , further comprising a nozzle to dispense fuel.

27. A fuel dispenser according to claim 14 , further comprising a display.

28. A fuel dispense according to claim 14 , further comprising a measuring device arranged in said measurement volume.