Resources Contact Us Home
Browse by: INVENTOR PATENT HOLDER PATENT NUMBER DATE
 
 
Browse by Category: Main > Engineering
Class Information
Number: 137/302
Name: Fluid handling > Hydrant type > Protection against freezing > Stop and waste
Description: Apparatus in which freezing of water in the riser is prevented by providing an auxiliary valve operated in at least one direction by the actuator of the main valve for draining the riser when the main valve is closed.










Sub-classes under this class:

Class Number Class Name Patents
137/307 Reciprocating relatively fixed valves 20
137/304 Separate relatively movable valves with single actuator 3
137/303 With disabling means 0


Patents under this class:

Patent Number Title Of Patent Date Issued
8387651 Self-draining frost-free faucet Mar. 5, 2013
8316876 Flushing device with removable drain ring for potable water systems Nov. 27, 2012
7278442 Vented port-cap for fire hydrant Oct. 9, 2007
6966332 Air valve assembly for a fire hydrant Nov. 22, 2005
6561214 Hydrant with improved drain mechanism May. 13, 2003
5701925 Sanitary yard hydrant Dec. 30, 1997
5617892 Irrigation system shut-off valve Apr. 8, 1997
5289840 Yard hydrant Mar. 1, 1994
5158105 Anti-siphon freezeless hydrant Oct. 27, 1992
5129416 Anti-siphon frost-proof water hydrant Jul. 14, 1992
5029603 Anti-siphon frost-proof water hydrant Jul. 9, 1991
4974637 Self draining valve Dec. 4, 1990
4756479 Flush hydrant Jul. 12, 1988
4653521 Freezeless ground hydrant and method for operating same Mar. 31, 1987
4653522 Ground hydrant and method for operating same Mar. 31, 1987
4532954 Wall hydrant Aug. 6, 1985
4316481 Wall hydrant Feb. 23, 1982
4178956 Self-draining sill cock assembly Dec. 18, 1979











 
 
  Recently Added Patents
Signal generator
Accessing device via communication protocol selection
Consistent retention and disposition of managed content and associated metadata
Techniques to manage communications resources for a multimedia conference event
Apparatus and method for storing event information for an HVAC system
Image capture system and method
Method and system for shared high speed cache in SAS switches
  Randomly Featured Patents
Carbon dioxide production system with integral vent gas condenser
Eddy current flaw detector utilizing plural sets of four planar coils, with the plural sets disposed in a common bridge
Blur resistant barcode
Circular display device with a projective light source
Vehicle seat assembly with inboard side air bag
Method of multidimensional interpolation for color transformations
Column-parallel sigma-delta analog-to-digital conversion with gain and offset control
Cleaning system for heat conductive conduits of a heat exchanger
Circuit and method for accurately mirroring currents in application specific integrated circuits
Movable scanning system responsive to platen cover postion and operation mode