Process plants consist of hundreds, or even thousands, of control loops all networked together to produce a product to be offered for sale. Each of these control loops is designed to keep some important process variable such as pressure, flow, level, temperature, etc. within a required operating range to ensure the quality of the end product.
Valves are a critical element of a control system in industrial process animation—designed to sustain high pressure and temperatures, to open and close quickly to control flow, to provide strength against erosion and corrosion or to be sterile to meet strict documentation requirements. The most common final control element in the process control industries is the control valve. The control valve manipulates a flowing fluid, such as gas, steam, water, or chemical compounds, to compensate for the load disturbance and keep the regulated process variable as close as possible to the desired set point.
Control valves play a critical role in the Power and Process industries, as they serve as the final control element in the process control scheme. Control valves directly control flow and depending on the control loop, indirectly control pressure, temperature, and other process variables.
The primary function of a safety valve is to protect property and life. Because a safety valve is often the last device to prevent catastrophic failure under pressure conditions, it is important that the valve works at all times i.e. it must be 100% reliable.
Safety valves should be installed wherever the maximum allowable working pressure of a system or pressure containing vessel is likely to be exceeded. Pressure excess can be generated in a number of different ways including:
Failure of a cooling system allowing vapour or fluid to expand.
Compressed air or electrical power failure to control instrumentation
During the start-up conditions of a plant
The term “Safety Valve” and “Relief Valve” are generic terms to describe a variety of pressure relief devices. A wide range is available based on the application and required performance criteria. The different designs are required to meet numerous national standards.
Our valves are also designed with a variety of trim configurations and materials of construction to ensure reliable performance and long life.