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Valve actuator with setting actuator

An actuator and set point technology, which is used in fluid pressure control without auxiliary power, valve lifters, instruments, etc., and can solve problems such as control difficulties and oscillations

Active Publication Date: 2016-10-12
DANFOSS AS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Most problems arise when the control valve is essentially closed allowing little fluid to pass, in which case control becomes difficult and can lead to oscillations

Method used

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  • Valve actuator with setting actuator
  • Valve actuator with setting actuator
  • Valve actuator with setting actuator

Examples

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Embodiment Construction

[0016] Figure 1A One example of a valve actuator 1 for which the invention can be used with advantage is shown, which is a differential pressure actuator.

[0017] The valve actuator 1 in this example comprises a disc-supported membrane 2 enclosed in a membrane housing 3 . Instead of the membrane 2, the valve actuator 1 can comprise a piston or the like. Generally, this membrane can be referred to as a displacement member 2 . Hereinafter, this member will be referred to as membrane 2 .

[0018] The membrane 2 is connected to a biasing element 4 hereinafter referred to as a spring 4 on a spindle 5 (or valve stem etc.) and a nut 6 without loss of generality. The pressure signal is transmitted to both sides of the membrane 2 via pressure connectors 7 on the membrane housing 3 which can be separate (independent) parts or an integral part.

[0019] A setting actuator 8 is mounted connected to the spring 4 and is used to vary the compression or tension of the spring 4 . The set...

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PUM

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Abstract

The present invention relate to the control of a valve that enables the self-acting (differential) pressure controller to alter its set point according to a demand of the system over which it con-trols (differential) pressure (i.e. a control valve, to improve control ability) or the demand of the network of which part it is (i.e. to achieve better hydraulic balance) or to input from a network or a system operator.

Description

technical field [0001] The present invention relates to affecting the operation of a control valve by changing a system parameter in a fluid flow system when the control valve is operating under conditions that can affect the overall operation of the fluid flow system. This is enabled by the introduction of a balancing system capable of balancing system parameters to adjustable set points, and wherein the balancing system includes a set actuator capable of adjusting in response to the operating value of the control valve Adjust the setting of the set point. In the main body of a non-limiting embodiment of the invention, the fluid flow system is a heating system connected to a district heating source in which a control valve controls the fluid flow and acts as a balancing system for the differential pressure controller A differential pressure valve actuator affecting the balancing valve is included, and wherein the set point is a set differential pressure which can optionally ...

Claims

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Application Information

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IPC IPC(8): F16K31/126F16K1/32
CPCF16K1/32F16K31/1262F24D19/1006G05D16/02G05D16/0663F24D10/006Y02E20/14F16K31/1264F16K31/165Y02B30/17G05D16/028G05D16/06G05D16/16
Inventor 波斯达·洛斯坦基亚托马兹·扎加尔本杰明·德罗拜斯优罗斯·奥波拉克格雷戈尔·坡德扎
Owner DANFOSS AS
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