Steam check valves
Steam check valves or steam non-return valves are installed in pipeline systems, to enable the movement of the medium in one direction only.
Steam check valves work entirely through the steam line fluid reaction, and thus no external actuation is needed. In this context, the flow direction expected or desired is called 'forward flow'.
Although steam check valves can effectively shut off the reverse flow, they should never be used in place of an isolation valve to contain live steam, in a section of pipe.
The 'reverse flow' is in the opposite direction. These forces may cause a wave of pressure to run up and down pipework until the dissipation of the energy
There are several reasons for the use of the steam check valves, including the Protection of any equipment item that may be affected by reverse flow, such as flowmeter, strainer, and control valves. For starters, water-hammer to test the pressure surges associated with hydraulic forces.
These hydraulic forces may cause a wave of pressure to run up and down pipework until the dissipation of the energy.
Extraction Check Valve for steam
ApplicationExtraction check valves are valves used to prevent the back flow of the service fluid in extraction lines of steam turbines. Each extraction check valve is designed exactly for the specified extraction parameters.Working mediumsteam, gases. If with actuator - no more than 80 C temperature;Working temperature+450°C to DN 800, NPS 32“+350°C to DN 800, NPS 32“Technical description The extraction check valve is designed as a swing check valve with double ecce..
Extraction Check Valve for steam - ANSI
ApplicationExtraction Check Valves for steam - ANSI are valves used to prevent the back flow of the service fluid in extraction lines of steam turbines. Each extraction check valve is designed exactly for the specified extraction parameters.Working mediumsteam, gases. If with actuator - no more than 80 C temperature;Working temperature+450°C to DN 800, NPS 32“+350°C to DN 800, NPS 32“Technical description The extraction check valve is designed as a swing check valve..
What is the primary function of a steam check valve?
The primary function of a steam check valve is to allow the flow of steam in one direction only, effectively preventing any reverse flow. This is crucial in maintaining the integrity of the system and ensuring that steam travels only towards the intended direction.
How does a steam check valve operate without external actuation?
A steam check valve operates based on the reaction of the steam line fluid itself. The pressure differential created by the flow of steam activates the valve, eliminating the need for external actuation. This ensures immediate response to changes in flow direction without manual intervention.
Can steam check valves be used as isolation valves?
No, steam check valves should not be used as isolation valves for containing live steam in a section of pipe. While they are effective at preventing backflow, they do not provide the necessary sealing capabilities required for isolation. For isolation purposes, dedicated isolation valves should be utilized.