Multi-way valve

Abstract

A multi-way valve has a housing with a stepped bore forming two piston guiding regions and a shoulder ring with two sealing shoulders. The housing also has a first, second and central transverse bores which are spaced along the cylindrical bore. A contact piston has a piston rod and sealing members secured thereon. The guide members are pressed fit onto opposite ends of the piston rod.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

A preferred embodiment of the invention is illustrated in the drawings and will be described below.

FIG. 1 show an embodiment of a multi-way valve in a plan view from five sides and two isometric illustrations, i.e.

a) in a first side view

b) in a plan view

c) in a second opposite side view

d) in a first end view

e) in a second opposite end view

f) in a perspective view of the upper side

g) in a perspective view of the underside.

FIG. 2 shows a cross-sectional view of a multi-way valve along lines 2A-2A shown in FIG. 1b

a) in a first embodiment in an overall view

b) in a fragmentary view of a second embodiment

FIG. 3 shows the control piston of the multi-way valve according to FIG. 2 in an enlarged illustration

a) in a side elevational view of the longitudinal axis

b) in a cross-section along line 3B-3B as shown in 3A

c) in the enlarged fragmentary detail in area 3C as shown in FIG. 3b

Claims

1. A multi-way valve having a housing with a stepped bore which forms two piston guiding regions and a shoulder ring with two sealing shoulders; a first, second and central transverse bores which are spaced along with cylindrical bore and which end in the cylindrical bore; a control piston which comprises a piston rod and sealing members secured thereon; wherein, depending on the position, one sealing member rests against one of the sealing shoulders for the purpose of sealing off a first transverse bore from a central transverse bore and wherein the other sealing member is disengaged from the associated sealing shoulder for the purpose of providing fluid communication between the central transverse bore and a second transverse bore said multi-way valve comprising: said piston rod pressed thereon by means of a press fit onto opposite ends of the piston rod for guiding the piston rod in the bore.

2. A multi-way valve as defined in claim 1 further comprising: the guiding member being axially supported by supporting shoulders of the piston rod.

3. A multi-way valve as defined in claim 2 further comprising: the guiding members being axially supported via annular-disc-shaped sealing members on the supporting shoulders.

4. A multi-way valve as defined in claim 2 further comprising: the annular disc-shaped sealing members being positioned via a press fit on the piston rod and being directly axially supported on the supporting shoulders of the piston rod.

5. A multi-way valve as defined in claim 1 further comprising: one of the guiding members being axially and yieldably supported via a helical pressure spring against a housing cover for closing the cylindrical bore.

6. A multi-way valve as defined in claim 5 further comprising: the other of the guiding members being sealed by sealing means relative to its piston guiding region for the purpose of forming a pressure chamber in the housing.

7. A multi-way valve as defined in claim 5 further comprising: the guiding members being made from plastic material.

8. A multi-way valve as defined in claim 7 further comprising: the sealing members being made of metallic material and carrying elastomeric sealing elements.

9. A multi-way valve as defined in claim 8 further comprising: O-rings being interposed between and forming a seal between the sealing members and the guiding members on the piston rod.

10. A multi-way valve as defined in claim 9 further comprising: said housing being a light metal pressure die casting.

11. A multi-way valve as defined in claim 10 further comprising: the central transverse bore ending in a reduced diameter section of the cylindrical bore in the region of the shoulder ring.

12. A multi-way valve as defined in claim 11 further comprising: said piston rod being provided with an outer annular collar which is positioned axially centrally between the sealing members and is slideably and sealingly arranged with respect to the shoulder ring.

13. A multi-way valve as defined in claim 11 further comprising: said shoulder ring having an inner annular collar which is arranged axially centrally between the sealing shoulders and which is sealingly arranged relative to the piston rod.

14. A multi-way valve as defined in claim 11 further comprising: said shoulder ring having an inner annular collar; andsaid piston rod being provided with an outer annular collar which within the operating range of the control piston is sealingly arranged with respect to the inner annular collar.

15. A multi-way valve as defined in claim 4 further comprising: said piston rod being provided with an outer annular collar which is positioned axially centrally between the sealing members and is slideably and sealingly arranged with respect to the shoulder ring.

16. A multi-way valve as defined in claim 4 further comprising: said shoulder ring having an inner annular collar which is arranged axially centrally between the sealing shoulders and which is sealingly arranged relative to the piston rod.

17. A multi-way valve as defined in claim 4 further comprising: said shoulder ring having an inner annular collar; andsaid piston rod being provided with an outer annular collar which within the operating range of the control piston is sealingly arranged with respect to the inner annular collar.

18. A multi-way valve comprising: a housing being a stepped bore with a reduced diameter central shoulder ring area and two end piston guiding regions; axially spaced transverse bores in said housing intersecting said stepped bore at both end piston guiding sections and reduced diameter central ring area;a piston having a piston rod and two opposing guide members at opposite ends of the piston rod;said piston guide member having sealing members for sealing against the reduced diameter central ring area; andsaid piston having a central collar which is slideably and sealingly arranged with respect to the reduced diameter central shoulder ring area.

19. A multi-way valve as defined in claim 18 further comprising: said reduced diameter shoulder ring having an inner annular collar which is arranged to be in sliding and sealing contact with said collar on said piston.