Backflow Preventer

a backflow preventer and flue technology, applied in the field of flue backflow preventers, can solve the problems of increasing the size or volume of the device as it is installed, increasing the cost of design, installation, maintenance, and inconvenience, and achieve the effect of reducing the backflow in the pressure zon
US20070240765A1Inactive Publication Date: 2007-10-18A R I FLOW CONTROL ACCESSORIES LTD
14 Cites 36 Cited by

Patent Information

Authority / Receiving Office
US · United States
Patent Type
Applications(United States)
Current Assignee / Owner
A R I FLOW CONTROL ACCESSORIES LTD
Publication Date
2007-10-18
Estimated Expiration
Not applicable · inactive patent

Smart Images

  • Figure 1
    Figure 1
  • Figure 2
    Figure 2
  • Figure 3
    Figure 3
Patent Text Reader

Abstract

A reduced pressure zone backflow preventer comprising a body 12 entirely made of plastic material, formed with an inlet port (14) accommodating an inlet check valve assembly 120 and an outlet port accommodating an outlet check valve assembly 122. The check valve assemblies extend along a coaxial axis coinciding with a longitudinal axis of the body. A central space 60 formed between the check valves is accessible through a service opening in the body. A relief valve assembly 70 is received within the central space and a drain port extends from the space. The relief assembly is responsive to pressure differential between the inlet port and the space by a flow passage extending between the inlet port and an upper side of a pressure diaphragm of the relief valve assembly.
Need to check novelty before this filing date? Find Prior Art

Description

FIELD OF THE INVENTION

[0001] The present invention relates to fluid backflow preventers and more particularly it is concerned with Reduced Pressure Zone backflow preventers, often referred to as RPZ. Even more specifically, the present invention is concerned with structural features of an RPZ. BACKGROUND OF THE INVENTION

[0002] Backflow preventers are well known and are typically used for allowing flow of water (or other fluid) from a source (such as a municipal water supply) to an end user (consumer). A backflow preventer is used to prevent flow of the fluid (e.g. water) in the reverse direction (e.g., for avoiding contamination of a municipal potable water supply, by contaminated water, chemicals, fertilizers, and pesticides and the like which may be supplied through an automatic dosing device, etc.). Such systems are often obligatory under different municipal and other codes and requirements.

[0003] A number of configurations are known in the art for avoiding backflow including ...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More