Valve and mixing method for constant flow

Abstract

To provide a constant flow rate valve capable of performing differential pressure control easily and with superior responsiveness without making a fluid to be controlled stand still and without making it contact anything but a diaphragm, and also a method for mixing a constant fluid amount for mixing a plurality of fluids effectively using the valve. The system comprises a valve body 10, a valve operating chamber 20 formed by the valve body, a connection passageway 50, a valve system 30 installed in the valve operating chamber and a throttling part 60 installed in the connection passageway. In the valve operating chamber an inlet 11 for a primary fluid, a valve seat 15, an outlet 12 to the connecting flow path, an inlet 13 from the connecting flow path and an outlet 14 for a secondary fluid are formed. The valve system 30 comprises a first diaphragm part 41 to move in unison with a valve seat 31, a second diaphragm part 42 and a third diaphragm part 43.

Description

technical field [0001] The invention relates to a constant flow valve and a quantitative flow mixing method for mixing multiple fluids using the constant flow valve. Background technique [0002] Conventionally, as a constant flow valve for supplying a fluid flow at a constant rate, it has been widely used to guide a part of the secondary pressure side fluid to a control chamber having a valve member, and use this as a control pressure to form a constant supply flow rate. Technology. However, in this constant flow valve, the fluid stays in the pipe (pipe) for controlling the pressure to form so-called stagnant water, and miscellaneous bacteria may multiply or be mixed into the fluid at this time. In order to solve this problem, for example, a full-flow replacement type constant flow valve without using a conduit is proposed as described in Japanese Patent Application Laid-Open No. 6-123371. [0003] Figure 6 The shown constant flow valve 90 relates to the structure disclo...

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Problems solved by technology

[0006] In addition, the constant flow valve 90 has a structure in which the spring bodies 121 and 113 are provided in the part in contact with the fluid inside the device, so there is a structural problem that the differential pressure cannot be changed from the outside.

In addition, since the pressure receiving area of ​​the pressure receiving member 120 or the valve member 113 is not considered, it is difficult to maintain a constant differential pressure. When the resistance caused by throttling is large, the flow rate can be controlled with good accuracy, but when the resistance is small and the differential pressure is low When it is used, there is a problem that it cannot function effectively with respect to the pressure fluctuation of the primary side and the secondary side.

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