Single seat valves feature a simple design with few internal parts hence more stability and less mass as compared to double seat valves. With the simple perpendicular motion of the stem towards or away from the seat, you can shut off or open the port allowing for the fluid to flow.
The distance between the valve plug and the valve seat when the port is open determines the rate of flow of the fluid.
In the case of manual maneuver, the stem/seal and the body feature thread that wedge between each other when the stem is rotated by the hand. The stem will feature a handle that is turned to produce the vertical movement of the plug towards or away from the valve body.
In automatic maneuver, the stem is smooth and manipulates the valve position by gliding through the body. The valve will feature remote-controlled or self-activating solenoid and pneumatic actuators.
Sanitary single seated valves are simple, with very few internal parts that allow for easier maintenance operations. To get to the valve components, you just have to dislodge the bonnets off. Few internal parts enhance the stability of the valve against the fluid pressure.
Single seated valves are also smaller and lighter but with excellent shut off capability as compared to double seated valves. They do not add to the mass of the pipes or fluid container. The reduced mass also reduces vibration and noise during plug operations.
The single seated valve comes in an assortment of trim configurations to allow for the flow characteristic you want. As aforementioned, you can get the angle design, the Y-body, or the Z-body.
Depending on your sanitation requirement, you can get single seated valves from DN25/1’’— DN100/4’’ in size with intelligent controllers and indicators to show the state of the port — closed or open. This could be position sensors, pressure sensors with AISI 316L wetted parts to regulate the valve’s opening range. Single seated valves are also available in FDA approved FPM Viton gaskets to prevent leakages and enable sterile processes.
The only con of single seated valves is that very complex valve designs are required if you have to balance high-pressure systems, but otherwise single seated valves designs are modular and hygienic to support a wide variety of sanitary application.
Depending on the application you want to carry out, you can get sanitary single seat valves with the following options:
- Sizes DN25/1” – DN100/4”.
- EPDM, Silicone or FPM made gaskets in compliance with FDA 177.2600
- DIN, RJT, IDF or SMS end connections.
- Steam barrier (if shaft sterilization is required)
- Body jacket insulation.
- Ra 20μin (0.5μm) for internal surface finish.
- The change-over single seat valve is also available and allows for switching between Normally Open and Normally Closed by rotating the cylinder 180°.
- External proximity sensor
Other configurations include extra intelligent controllers and indicators to show the state of the port – closed or open. This could be position sensors, pressure sensors with AISI or 316L wetted parts to regulate the valve’s opening range. The IL-TOP unit, for example, is an intelligent control module that allows you to set a value that will be used to position the valve as open or closed when specific logics are met.
As a manufacturer of stainless steel sanitary valves, SIMPLE VALVES aims to arm its potential customers with information that would help them in making an informed decision.
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