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Understanding the principle of pneumatic pressure regulating valves is crucial for making the right selection.

Understanding the principle of pneumatic pressure regulating valves is crucial for making the right selection.

The pneumatic pressure regulating valve is a pressure-balanced type, featuring cage-guided operation and a dual-seal design. It is equipped with a multi-spring pneumatic diaphragm actuator, which boasts a compact height, lightweight construction, and easy installation.

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Causes and Prevention of Flashing and Cavitation in Control Valves

Causes and Prevention of Flashing and Cavitation in Control Valves

Flash vaporization occurs when a non-compressible fluid, after being throttled through a control valve, experiences a drop in static pressure—from the vena contracta section all the way to the valve outlet—until the pressure equals or falls below the fluid’s saturation vapor pressure at the valve inlet temperature. This causes partial liquid evaporation, resulting in a two-phase mixture of gas and liquid downstream of the valve. The onset of flash vaporization leads to a point where the liquid flow no longer increases with further pressure drops, triggering choked flow conditions. Additionally, flash vaporization generates a gas-liquid two-phase flow, with both gas and liquid simultaneously flowing through the valve trim and downstream piping, causing erosion. A distinctive feature of this phenomenon is that the valve trim develops a smooth, polished appearance.

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2020

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Design and Selection of Low-Noise Control Valves

Design and Selection of Low-Noise Control Valves

Most noise in control valves occurs with compressible fluids, as some of the energy is converted into sound during the throttling process. A common rule of thumb for estimation is this: if the product of the Cv value and the inlet pressure exceeds 1,000, the control valve will generate significant noise under critical pressure drop conditions.

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2020

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Petrochemical

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2025

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Chemical industry

Chemical industry

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2025

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Medical

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Drainage

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Electricity

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