US 5,476,118 A · Non-stagnant piping system

Abstract

The present invention relates to a non-stagnant piping system and it is an object of this invention to provide a piping system such that the fluid inside the upstream side piping of a valve portion and inside the valve will not become stagnant in a super pure water line and chemical solution, etc., regardless of whether the valve is in a closed or opened state. A diaphragm valve 3 having a by-pass means 3b installed on the upstream side of the valve portion 3a is mounted in the sub-line 2 branched from the main line 1 in the piping system, and a pressure reducing unit 4 having a pressure reducing portion by a throttling portion 4a, and a by-pass 4b communicating with the throttling portion 4a is installed on the downstream side of the branch point with the sub-line 2 in the main line 1, and moreover, both by-pass means 3b and 4b communicate with each other.

Claims17

Dependent claims

A non-stagnant piping system in a piping line for the purpose of fluid transportation, comprising:

a delivery pipe connected to said piping line,
a valve unit in said delivery pipe, said valve unit having a fluid closing function that ensures a substantial sealing of the fluid,
a valve unit by-pass means for transporting fluid in the delivery pipe away from a sealing point of the valve unit to prevent stagnation of fluid at an upstream side of the valve unit,
a pressure reducing unit having a pressure reducing portion including a throttling means in the interior of the piping line,
by-pass connecting means for communicating said valve unit by-pass means directly with said throttling means,
said pressure reducing unit is installed at a location where it is possible to suck substantially all of the fluid between the valve unit and the valve unit by-pass means when the valve unit is closed, and
wherein said delivery pipe has an axial direction and a first diameter, and wherein a distance along said axial direction between said sealing point of said valve unit and said valve unit by-pass means is substantially equal to or less than said first diameter.

4 more elements

Dependencies are inferred from the claim text.

Non-stagnant piping system

Life of this patent

Non-stagnant piping system

Life of this patent

Abstract

Claims17