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A valve has a housing formed with a central chamber centered on and extending along a main axis, an inlet passage and an outlet passage having mouths in the chamber spaced angularly from and confronting each other, and a secondary passage offset from the inlet and outlet passages and centered on an

A valve has a housing formed with a central chamber centered on and extending along a main axis, an inlet passage and an outlet passage having mouths in the chamber spaced angularly from and confronting each other, and a secondary passage offset from the inlet and outlet passages and centered on an axis offset from a center of one of the mouths by more than 90°. A valve pin fitted in the chamber is formed with a secantally throughgoing flow passage centered on a flow-passage axis generally parallel to but offset from a diameter of the pin. A filter is provided in the flow passage, the secondary passage being sufficiently large that, when the pin is pivoted to align the flow passage with the secondary passage, the filter can be removed from the flow passage through the secondary passage.

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1. A valve comprising: a housing formed with a central chamber centered on and extending along a main axis,an inlet passage and an outlet passage having mouths in the chamber spaced angularly from and confronting each other, anda secondary passage offset from the inlet and outlet passages and center

1. A valve comprising: a housing formed with a central chamber centered on and extending along a main axis,an inlet passage and an outlet passage having mouths in the chamber spaced angularly from and confronting each other, anda secondary passage offset from the inlet and outlet passages and centered on an axis offset from a center of one of the mouths by more than 90°;a valve pin fitted in the chamber formed with a secantally throughgoing flow passage centered on a flow-passage axis generally parallel to but offset from a diameter of the pin, the valve pin being angularly shiftable between a use position with the flow passage aligned between the mouths of the inlet and outlet passages for flow of liquid between the inlet and outlet passages through the flow position andanother position with the flow passage aligned with the secondary passage and not aligned with the inlet and outlet passages and the pin blocking flow into and out of the inlet and outlet passages through the respective mouths; anda filter in the flow passage, the secondary passage being sufficiently large that in the other position the filter can be removed from the flow passage through the secondary passage, the housing being formed on the opposite side from the secondary passage with a bore provided as an opening in the housing for a tool by means of which the filter is removable. 2. The apparatus according to claim 1 wherein a connector fitting for a drive is installed on the housing. 3. The apparatus according to claim 2 wherein the drive is pivotally affixed to the connector fitting, and is able to drive an actuating link associated with the drive, the actuating link being rotatably connected at the end of the rotary arm. 4. The apparatus according to claim 2 wherein the housing is provided with heating cartridges. 5. A valve comprising: a housing formed with a central chamber centered on and extending along a main axis,an inlet passage and an outlet passage having mouths in the chamber spaced angularly from and confronting each other, anda secondary passage offset from the inlet and outlet passages and centered on an axis offset from a center of one of the mouths by more than 90°;a rotatable valve pin fitted in the chamber and formed with a secantally throughgoing flow passage centered on a flow-passage axis generally parallel to but offset from a diameter of the pin;a rotary arm extending from the pin;a connector fitting on the housing;a drive pivotally mounted on the connector fitting;an actuating link pivotally connected between the drive and the rotary arm, the rotatable pin, the rotary arm, or the actuating link being thermally decoupled, the valve pin being angularly shiftable by the drive between a use position with the flow passage aligned between the mouths of the inlet and outlet passages for flow of liquid between the inlet and outlet passages through the flow position andanother position with the flow passage aligned with the secondary passage and not aligned with the inlet and outlet passages and the pin blocking flow into and out of the inlet and outlet passages through the respective mouths; anda filter in the flow passage, the secondary passage being sufficiently large that, in the other position the filter can be removed from the flow passage through the secondary passage. 6. The apparatus according to claim 5 wherein the rotary arm or the actuating link are made of a thermally insulating material. 7. The apparatus according to claim 5 wherein the rotary arm or the actuating link are made of a material having low thermal conduction. 8. The apparatus according to claim 5 wherein the rotational angle of the pin on movement between the use and other positions is >90° and 180°. 9. The apparatus according to claim 8 wherein the pin is rotated by 110° on movement between the use and other positions. 10. The valve defined in claim 5 wherein the inlet and outlet passages are centered on a common passage axis extending secantally through the chamber offset from a diameter of the chamber and lying generally in a common plane perpendicular to the main axis with a secondary-passage axis and with a flow-passage axis. 11. The valve defined in claim 5 further comprising: the rotary arm fixed to and extending radially of the main axis from an outer end of the pin; and the actuating link coupled to the rotary arm for pivoting the pin between the use position and the other position. 12. The valve defined in claim 5 wherein the secondary passage has a blind inner end and the pin is further formed with a discharge passage extending generally axially from the inner end of the secondary passage to an end face of the pin. 13. A valve comprising: a housing formed with a central chamber centered on and extending along a main axis,an inlet passage and an outlet passage having mouths in the chamber spaced angularly from and confronting each other, anda secondary passage offset from the inlet and outlet passages and centered on an axis offset from a center of one of the mouths by more than 90°;a valve pin fitted in the chamber formed with a secantally throughgoing flow passage centered on a flow-passage axis generally parallel to but offset from a diameter of the pin, the valve pin being angularly shiftable between a use position with the flow passage aligned between the mouths of the inlet and outlet passages for flow of liquid between the inlet and outlet passages through the flow position andanother position with the flow passage aligned with the secondary passage and not aligned with the inlet and outlet passages and the pin blocking flow into and out of the inlet and outlet passages through the respective mouths; anda filter in the flow passage, the secondary passage being sufficiently large that, in the other position, the filter can be removed from the flow passage through the secondary passage, the flow passage having a large-diameter upstream portion fitting with the mouth of the inlet passage in the use position and a small-diameter downstream portion fitting with the mouth of the outlet passage in the use position, the filter being of substantially the same diameter as the upstream portion and fitting snugly therein, the secondary passage being of a diameter at least as great as the upstream portion, the housing further being formed with an access bore opening into the chamber in secantal alignment with the secondary passage and blocked by the pin in the use position, the flow passage extending between the secondary passage and the access bore in the other position such that a tool inserted through the access bore can knock the filter out of the flow passage into the secondary passage.