Low-noise valve

Claim 2

A valve arrangement comprising: a valve body having a fluid passage portion, a valve means disposed in said valve body for controlling the flow of fluid through said valve body, means provided downstream of said valve member extending substantially along the entire inner wall of said fluid passage portion for damping undesireable vibrations, and means disposed within said fluid passage portion downstream of said means for damping undesireable vibrations for supplying a back pressure to the downstream side of said valve member.

Claim 3

A valve arrangement comprising: a valve body having a fluid passage portion, a valve means disposed in said valve body for controlling the flow of fluid through said valve body, means provided downstream of said valve member extending substantially along the entire inner wall of said fluid passage portion for damping undesireable vibrations, and means disposed within said fluid passage portion downstream of said means for damping undesireable vibrations for supplying a back pressure to the downstream side of said valve member.

Claim 4

A valve arrangement comprising: a valve body having a fluid passage portion, a valve means disposed in said valve body for controlling the flow of fluid through said valve body, means provided downstream of said valve member extending substantially along the entire inner wall of said fluid passage portion for damping undesireable vibrations, and means disposed within said fluid passage portion downstream of said means for damping undesireable vibrations for supplying a back pressure to the downstream side of said valve member.

Claim 5

A valve arrangement according to claim 1, wherein said last mentioned means is a partition means disposed in said fluid passage portion downstream of said means for damping undesireable vibrations.

Claim 6

A valve arrangement according to claim 2, wherein said partition means includes at least one aperture therein for permitting a predetermined back pressure on said valve means.

Claim 7

A valve arrangement according to claim 3, wherein at least a pair of means for damping undesireable vibrations are provided in said fluid passage portion.

Claim 8

A valve arrangement according to claim 1, wherein said means for damping undesireable vibrations is a deformable member having a large internal damping effect, and wherein means are provided for preventing undesirable deformation of said member.

Claim 9

A valve arrangement according to claim 5, wherein said last-mentioned means includes a coil spring provided in said deformable member.

Claim 10

A low-noise valve comprising: a fluid passage portion, a valve body having a valve member disposed in a high-pressure fluid conduit system for controlling the flow rate of hydraulic fluid from the high pressure to a low-pressure side, vibration damping means disposed within said valve body along the inner wall of the fluid passage portion on the downstream side of said valve member, and means disposed within said fluid passage portion downstream of said vibration damping means for imparting a back pressure to the low-pressure downstream side of said valve member.

Claim 11

A low-noise valve comprising: a fluid passage portion, a valve body having a valve member disposed in a high-pressure fluid conduit system for controlling the flow rate of hydraulic fluid from the high pressure to a low-pressure side, vibration damping means disposed within said valve body along the inner wall of the fluid passage portion on the downstream side of said valve member, and means disposed within said fluid passage portion downstream of said vibration damping means for imparting a back pressure to the low-pressure downstream side of said valve member.

Claim 12

A low-noise valve as claimed in claim 7, wherein the back pressure imparted to the low-pressure downstream side of said valve member is substantially constant.

Claim 13

A low-noise valve as claimed in claim 8, wherein at least one additional valve member is disposed in said valve body on the downstream side of said valve member, said additional valve member imparting the back pressure to said upstream side valve member.

Claim 14

A low-noise valve as claimed in claim 9, wherein said upstream side valve member and said downstream side valve member are constructed to effect interlocking operation.

Claim 15

A low-noise valve as claimed in claim 8, wherein said valve member is composed of a valve poppet and a valve skirt, and a plurality of orifices are formed in said valve skirt.

Claim 16

A low-noise valve as claimed in claim 7, wherein said vibration damping means is removably mounted in place.

Claim 17

A low-noise valve as claimed in claim 7, wherein said vibration damping means is composed of a rubber member and a supporting member embedded in said rubber member for preventing undesirable deformation of said rubber member.

Claim 18

A low-noise valve as claimed in claim 13, wherein said supporting member is a coil spring.

Claim 19

A valve arrangement comprising: a valve body having a fluid passage portion, a valve means disposed in said valve body for controlling the flow of fluid through said valve body, means provided downstream of said valve member extending substantially along the entire inner wall of said fluid passage portion for damping undesireable vibrations, and means for supplying a back pressure to the downstream side of said valve member including a partition means disposed in said fluid passage portion downstream of said valve means, said partition means including at least one aperture therein for permitting a predetermined back pressure on said valve means, said means for damping undesireable vibrations including at least a pair of damping means disposed in said fluid passage portion, said pair of damping means being disposed on respective sides of said partition means, and wherEin a second partition means is provided downstream of the second damping means.

Claim 20

A valve arrangement comprising: a valve body having a fluid passage portion, a valve means disposed in said valve body for controlling the flow of fluid through said valve body, means provided downstream of said valve member extending substantially along the entire inner wall of said fluid passage portion for damping undesireable vibrations, and means for supplying a back pressure to the downstream side of said valve member including a partition means disposed in said fluid passage portion downstream of said valve means, said partition means including at least one aperture therein for permitting a predetermined back pressure on said valve means, said means for damping undesireable vibrations including at least a pair of damping means disposed in said fluid passage portion, said pair of damping means being disposed on respective sides of said partition means, and wherEin a second partition means is provided downstream of the second damping means.

Claim 21

A valve arrangement according to claim 15, wherein said damping means consists of deformable members having a large internal damping effect.

Claim 22

A low-noise valve comprising: a fluid passage portion, comprising a valve body having a valve member disposed in a high-pressure fluid conduit system for controlling the flow rate of hydraulic fluid from the high-pressure to a low-pressure side, vibration damping means disposed within said valve body along the inner wall of the fluid passage portion on the downstream side of said valve member, and means for imparting a back pressure to the low-pressure downstream side of said valve member, wherein the back pressure is imparted so that the ratio of P2/P1 between the fluid pressures P2 and P1 on the downstream and upstream sides of said valve member lies within the range of 0.05 to 0.5.

Claim 23

A low-noise valve comprising: a fluid passage portion, comprising a valve body having a valve member disposed in a high-pressure fluid conduit system for controlling the flow rate of hydraulic fluid from the high-pressure to a low-pressure side, vibration damping means disposed within said valve body along the inner wall of the fluid passage portion on the downstream side of said valve member, and means for imparting a back pressure to the low-pressure downstream side of said valve member, wherein the back pressure is imparted so that the ratio of P2/P1 between the fluid pressures P2 and P1 on the downstream and upstream sides of said valve member lies within the range of 0.05 to 0.5.