Flow rate controlling valve

Patent metadata

Field	Value
Publication number	US-2016291606-A1
Application number	US-201615086130-A
Country	US
Kind code	A1
Filing date	Mar 31, 2016
Priority date	Mar 31, 2015
Publication date	Oct 6, 2016
Grant date	—

Abstract

A table indicating a relationship between a differential pressure across a valve unit and a torque that is to be outputted by a motor (an output torque) is stored in a table storing portion. A valve opening controlling portion and a torque controlling portion are provided in a controlling portion. The valve opening controlling portion uses the actual opening θpv, from the valve opening detector, as the valve opening measured value, and sends a driving command to the motor so as to cause the valve opening measured value θpv to match the valve opening setpoint θsp. The torque controlling portion acquires, from the table, a torque corresponding to the differential pressure ΔP across the valve unit, detected by the differential pressure detecting portion, and sends, to the motor, a command (a torque output command) to cause outputting of the torque that has been acquired.

First claim

What is claimed is:

1 . A flow rate controlling valve comprising:
a valve unit for adjusting the amount of opening of a flow path through which a fluid flows; a valve rod that is linked to the valve unit; a driver driving the valve rod; a differential pressure detector detecting, as a differential pressure across the valve unit, a differential pressure between a pressure of a fluid on a primary side of the valve unit and a pressure of a fluid on a secondary side of the valve unit; a differential pressure-torque non-transitory storage storing a relationship between the differential pressure across the valve unit and a torque that is to be outputted by the driving portion; a drive quantity controller controlling a drive quantity for the valve rod by the driver so that a fluid with a desired flow rate flows within the flow path; and a driving torque controller calculating a torque corresponding to the differential pressure across a valve unit, detected by the differential pressure detector, from a relationship stored in the differential pressure-torque non-transitory storage, to control a driving torque of the valve rod by the driver so as to output this torque.

2 . The flow rate controlling valve as set forth in claim 1 , further comprising:
a valve opening detector detecting an actual opening of the valve unit from a driving position of the valve rod, wherein: the differential pressure-torque non-transitory storage stores a relationship between the differential pressure across the valve unit, an opening of the valve unit, and a torque that is to be outputted by the driver, wherein: the driving torque controlling portion calculates, from a relationship stored in the differential pressure-torque non-transitory storage, a torque corresponding to the differential pressure across the valve unit, detected by the differential pressure detecting portion, and an actual opening of a valve unit, detected by the valve opening detector, to control a driving torque of the valve rod by the driving portion.

3 . The flow rate controlling valve as set forth in claim 1 , further comprising:
an actual flow rate controller calculating an actual flow rate of a fluid flowing in the flow path based on the differential pressure across a valve unit, detected by the differential pressure detector, wherein: the drive quantity controller uses, as a measured value for a flow rate, an actual flow rate of the fluid that flows in the flow path, calculated by the actual flow rate calculator, to control a drive quantity of the valve rod by the driver so that this flow rate measured value will match a flow rate setpoint.

4 . The flow rate controlling valve as set forth in claim 1 , further comprising:
a valve opening detector detecting an actual opening of the valve unit from a driving position of the valve rod, wherein: the drive quantity controller uses, as a valve opening measured value, an actual degree of opening of the valve unit, detected by the valve opening detector, to control a drive quantity of the valve rod by the driver so that this valve opening measured value will match a valve opening setpoint.

5 . The flow rate controlling valve as set forth in claim 1 , wherein:
the driver comprises a motor wherein an output torque can be varied.

6 . The flow rate controlling valve as set forth in claim 1 , wherein:
the valve unit has a window through which a fluid flows from the primary side to the secondary side of the flow path; the driver causes the valve rod to rotate centered on an axis thereof; the drive quantity controller controls an amount of rotation of the valve rod by the driver; and a rotational position of the valve unit is varied in accordance with the rotation of the valve rod, to vary the flow rate of the fluid that passes through the window in accordance with the rotational position of the valve unit.

7 . The flow rate controlling valve as set forth in claim 1 , wherein:
the driver causes the valve rod to undergo a reciprocating operation in an axial direction thereof; the drive quantity controller controls a manipulated variable that is the reciprocation of the valve rod, by the driving operation; and the size of a gap between the flow path and the valve unit is varied in accordance with the reciprocating operation of the valve rod, to vary the flow rate of a fluid that passes through the gap between the flow path and the valve unit in accordance with the size of the gap.

Assignees

• Azbil Corp

Inventors

• Someya Hideaki
• Narita Hiroaki
• Saruwatari Makoto
• Ohashi Tomofumi

Classifications

• F16K37/0091

  by measuring fluid parameters · CPC title

• F16K37/005

  for measuring fluid parameters (F16K37/0033 takes precedence) · CPC title

• F24F5/0003

  Exclusively-fluid systems · CPC title

• G05D7/0635 Primary

  by action on throttling means (G05D7/0688, G05D7/0694 take precedence) · CPC title

• F16K31/04

  using a motor · CPC title