Valve

The solenoid valve is energized, the indicator light is on, and the power supply is available — but the valve still does not move. Have you ever experienced this situation during field operation? Before replacing the valve directly, it is better to follow a systematic troubleshooting process. In most cases, the problem can be identified […]

In industrial process control systems, control valves are critical devices for regulating flow, pressure, temperature, and level. A common problem encountered in chemical plants, power stations, oil & gas facilities, and water treatment systems is that the control valve command signal from the DCS does not match the actual valve position feedback signal. Typical symptoms

Introduction In chemical processing, power generation, HVAC, water treatment, and industrial automation systems, pneumatic control valves are widely used for accurate flow, pressure, temperature, and level regulation. Compared with electric actuators, pneumatic actuators provide excellent safety performance, explosion-proof capability, fast response, and reliable operation in harsh industrial environments. The actuator is the key driving component

Many people have a common misunderstanding about fire protection in chemical plants: If a valve is critical for safety, it must always be fully protected with a thick fireproof cover. However, the reality is not that simple. Installing fireproof covers on every emergency shutdown valve may increase project costs and create additional maintenance challenges without

Introduction When selecting a control valve, engineers often need to consider its failure position, such as Fail Open (FO) or Fail Close (FC). For conventional pneumatic control valves, the failure position can usually be selected by changing the actuator action, spring arrangement, or valve configuration. However, the situation is different for self-operated pressure control valves

Pump Outlet, Compressor Outlet and Common Industrial Applications Explained A fluid system does not warn you before it starts flowing backward. When reverse flow occurs, it can damage pumps, contaminate process materials, disturb production operations, and even create serious safety risks. A check valve (non-return valve) is a simple but critical component installed in piping

Many engineers assume that a control valve should always be one or two sizes smaller than the process pipeline. For example, a DN100 pipeline is often paired with a DN80 control valve, while a DN80 pipeline is commonly fitted with a DN50 valve. This practice has become so common that many people consider it a

A control valve is often considered the “hands and feet” of a process control system. Whether a plant can maintain stable pressure, temperature, flow, or liquid level depends heavily on whether the control valve operates correctly. When a control valve fails, many engineers immediately think about removing and disassembling the valve. However, in most cases,

Introduction Valve pressure drop is one of the most important parameters in valve selection and piping system design. Many engineers have a common misunderstanding: “A higher upstream pressure means a higher valve pressure drop.” This statement is not always correct. Valve pressure drop is not determined by upstream pressure alone. The actual pressure loss across

When Alarms Are Not Enough In many industrial incidents, the real danger is not the alarm itself — but what happens after the alarm. Pipelines rupture, yet media continues to leak.Fires break out, but fuel supply is not isolated.Gas detectors trigger alarms, yet gas flow is not stopped. In these situations, risk escalates rapidly. Fire,