GB805735A - Improvements in and relating to thermostatically-controlled fluid mixing valves - Google Patents

Abstract

805,735. Valves. DOLE VALVE CO. Nov. 22, 1955, No. 33429/55. Class 135. A mixing valve assembly comprises a hollow valve body 10, Fig. 1, open at its opposite ends and including a cylindrical mixing chamber 14, Fig. 9, the axis of which is substantially parallel to the open ends of the body. The valve body also has inlets 11, 12 for hot and cold water located between its open ends and a metering chamber 13 communicating with the chamber 14 and containing a thermostatically-controlled valve 53, Fig. 2, controlling the passage of the two water streams. The open ends of the valve body are closed by valve means 17, 18 and communicate with each other and with an outlet 15. The valve 17 controls the delivery of the mixed water from the chamber 14. The valve 18 controls a passage for by-passing water from one of the inlets round the mixing chamber. The inlets 11, 12 communicate with axially spaced ports 27, 24 respectively. These ports are separated by a central sealing rib 54 on the valve 53 which is formed as a tubular lift valve sealing on the end wall 19 of the valve body to cut off the hot water or on an inwardlydirected flange 66 on a sleeve 65 to cut off the cold water. The valve 53 has an internal spider 56 having a central socket to accommodate the piston 59 of a power-type thermal element 60. The socket has an extension 61 guided in a recess 63. The valve 53 is urged against the piston 59 by a spring 70. The thermal element has a casing containing deformable material which acts through a membrane of deformable material on the piston 59. The sleeve 65 is located in the chamber 14 by a longitudinal bead or spline engaging a corresponding recess in the wall of the chamber so that a port in the sleeve is in register with an outlet port 45, Fig. 9. The thermal element 60 has an enlargement 75 and seats in a dished retaining ring 76 held against the flange 66 by a spring 78 which yields to prevent overstrain of the valve against the end wall 19. The retainer 76 has an arcuate port at the opposite side of the chamber 14 from the port 45. The port 45 communicates by a passage 46 with the inlet side of a diaphragm valve 17 controlled by a solenoid-actuated auxiliary valve 49. The outlet 51 of the valve 17 communicates with the outlet 15 for the mixed fluid. The outlet 15 is fitted with a flanged fitting 107 and an annular resilient flow controlling disc 111. The inlet 11 is fitted with a hat-like strainer 105 and is divided by a partition 25, Fig. 10, into a passage 26 leading to the port 27 and a by-pass passage 30 connected to the inlet side of a diaphragm valve 18 controlled by a solenoid-actuated auxiliary valve 40. The outlet 33 of the valve 18 leads directly to the outlet 15 through a passage 34. Check valves.-The inlet to the passage 26 is provided with a check valve 86 to prevent back flow into the inlet 11. The valve 86 comprises a generally semi-circular flexible member with a slot 87 adjacent its curved periphery and recesses 99, 100 on its under side. The valve 86 is held against a shoulder 90 by a seat member 89 having a segmental port 95, and also ports 97 normally covered by the valve 86. The seat 89 has an arcuate rib 88 passing through the slot and engaging a shoulder 93. The seat 89 is retained by a splined ring 101 held beneath the ends of splines 103.