In processes where an excellent and high-quality control is required, where the fluid to be controlled is water, the control valve for water is required, they aim to maintain the variable in the case the water is at the desired value, the control valve for water is widely used in systems for temperature control which can be the injection of water in systems with higher temperatures to control an ideal temperature, for pH control to adjust a more acidic or basic mixture, among many other applications.
Risk Of Use Of Water Control Valve
As with all liquids, the water passing through the plug of the Water Control Valve can cause a significant reduction in the outlet pressure (downstream pressure), causing a phenomenon called cavitation.
Cavitation is caused by the increase in velocity and decrease in water pressure to the vapor point and return to the liquid state quickly generated by the restriction of fluid passage through the valve control orifice, causing implosions by steam bubbles and micro water jets that nick these steam bubbles, steam bubble implosions can cause pressure waves up to 100,000 PSI, the combination of bubble implosions and micro water jets severely damage the plug, seat, and body of the Water Control Valve, cavitation damage is usually rough and uneven, the cavitation itself can cause valve vibration and noise, leading to loss of efficiency and control.
Functioning Principle Control Valve For Steam
The control valve for steam consists of two main assemblies, the body, and the actuator. The body is the part of the valve through which the fluid passes and where the control action is performed, allowing greater or lesser passage of the fluid inside it, depending on the need of the process.
The steam control valve is a valve whose function is to obstruct a pipeline, allowing more or more miniature steam to pass through the system. This obstruction caused by the steam control valve can be partial or total, and activation can be manual or automatic.
There are several types of steam control valves, and they are divided into:
Linear displacement:
- Globe valve (conventional, three-way, cage and angle);
- Guillotine;
- Sliding disk;
Rotary displacement:
- Butterfly;
- Ball;
- Sectored sphere;
As mentioned above, the control valve for steam from Blackhawk supply can have two types of detachment. It is defined as a linear displacement valve, the valve in which the moving part responsible for sealing describes a straight movement activated by a sliding rod.
A rotary displacement valve is defined as a valve in which the moving part responsible for sealing describes a rotary movement actuated by a rotating rod.
Analog (modulated control) – In the case of modulated control, the valve will position itself according to the analog signal sent to it; this application requires greater complexity and technology to position itself precisely and at the right time in response to the sent signal.
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