A valve device having pressure-balanced spaced annular valve members
movably mounted on an operator rod and movable relative to spaced valve
seats in a valve body bore communicating with a central flow passage
between the seats and a pair of flow passages spaced outwardly of the
seats. The rod shifts each valve member individually relative to its seat
for selectively communicating the central flow passage with either of the
outwardly spaced flow passages, depending upon the direction off
longitudinal movement of the rod. The valve is used singly or is assembled
in stacked relationship with a plurality of identical valves with the
outwardly spaced flow passages aligned and in communication with each
other defining a pair of separate common flow passages extending the
length of the stack. Each valve in the stack is individually operable to
communicate its central flow passage with either of the common flow
passages of the stack. The valve stack is especially useful for
selectively communicating separate conduit lines leading to each of the
individual valves with either of two conduit lines connected into the
common flow passages of the stack.
Current U.S. Class: |
137/884 ; 137/614.11; 251/282 |
Current International Class: |
F16K 11/22 (20060101); F16K 11/10 (20060101); F15B 13/00 (20060101); F15B 13/04 (20060101); F15B 13/08 (20060101); F16d 001/00 () |
Field of Search: |
137/608,609,614.13,614.14,614.21,614.11 251/282
|