Automatic bypass valve

• US 5,372,157 A
• Filed: 03/01/1994
• Issued: 12/13/1994
• Est. Priority Date: 06/15/1993
• Status: Expired due to Term

• Current Assignee: P.A. S.R.L.
• Original Assignee: P.A. S.R.L.
• Inventors: Benetti, Arnaldo
• Primary Examiner(s): Hepperle, Stephen M.
• Application Number:
  US08/204,475
• Time in Patent Office: 287 Days
• Field of Search: 137/110, 137/115, 137/116
• US Class Current: 137/110
• CPC Class Codes: F16K 17/0473 Multiple-way safety valves
• CPC Class Codes: Y10T 137/2562 Dividing and recombining
• CPC Class Codes: Y10T 137/2617 Bypass or relief valve biased open

Abstract

A valve body has three openings: an inlet, an outlet and a flow-back opening, and is provided with an obturator of the flow-back opening and an obturator of the outlet, which outlet obturator is connected by means of a stem with a piston housed in a cylinder communicating with the outlet through a conduit. A recycling conduit places the outlet in communication with a recycling chamber communicating with the flow-back opening through a recycling opening closed by a third obturator, the recycling opening being freed by action of a rod solid to and intervening in conjunction with the second obturator.

Claims

1. An automatic bypass valve comprising:

a valve body having three openings;

the three openings being an inlet, an outlet and a flow-back opening;

a first obturator for closing the flow-back opening;

a piston, housed in a cylinder;

a stem for connecting said first obturator to the piston;

a conduit placing a chamber of said cylinder in communication with the outlet;

a second obturator for closing the outlet;

said second obturator being biased by a spring;

said second obturator having also a function of maintaining AN open communication between the outlet and the conduit;

a recycling conduit placing the outlet in communication with a recycling chamber;

said recycling conduit communicating with the flow-back opening through a recycling opening in the valve, on which recycling opening a third obturator operates;

a spring for maintaining said third obturator in a position closing the recycling opening;

a rod, fixed to the second obturator and acting on said third obturator in an opposite direction to a pressure direction of the spring.

2. A valve as in claim 1, wherein the recycling opening is aligned with an axis of the rod, which rod is mobile along said axis solidly to the third obturator.

3. A valve as in claim 1, comprising a choke valve arranged on the recycling conduit and capable of being calibrated externally of the valve.