Blind flange valves, or blind valves, are devices that restrict flow in pipes in order to carry out adjustments and maintenance on machinery, systems, and other various apparatuses. More than that, they provide a visual indication of their position, providing visibility to operators. They are also called 8 blind flanges as they have a rotating 8 shape, where one loop is a hollow disk and the other is a solid loop.
Easy to use and install, blind flange valves provide safety to both large and small projects. Most importantly, they are incredibly useful devices for high flow applications. In some actuation applications, the blind valve is rotated and the solid disk is responsible for restricting movement through the pipe. Meanwhile, the hollow disk protrudes from the valve to indicate that the valve is in a closed position.
Though the most common function of any variation of blind flange valve is to restrict the material flow in a pipe via the help of an actuator and switchable blind piece, they are also responsible for changing between closed and open positions with ease. In fact, their locking mechanism is equipped with a safety feature to restrict actuation in every position. While they are typically simple and compact in design, they become more complex when safety measures are added and size is increased. With this in mind, the next section will cover different types of blind flange valves.
Spectacle Blind Valve
These valves are designed to look like the number 8, and they are mainly utilized to switch between open and closed positions. Flanges wedged between two pipe gaskets and flanges use spectacle blind valves as permanent stoppers for fluids flowing in a pipe. They are available as single piece or two piece metal configurations depending on the load capacities of a particular application.
Cam Set Blind Valve
Cam set blind valves are similar to other blind valves with the exception that their cam mechanism is used to switch between open and closed positions. By turning a hand wheel, the flange is freed and can be turned to any desired positioning. Additionally, they are easy to install, finding use in paper and pulp, petrochemical, and refinery industries.
Cam Slide Blind Valve
Cam slide blind valves are usually implemented in an application when a high degree of accuracy is required. They consist of rectangular spectacle flanges that prevent operator error in an open or closed position. They also have a cam mechanism, and they can be adjusted to fit small pipe diameters.
Hammer Line Blind Valve
This last type of blind valve is utilized to ensure visibility when a pipeline is blinded with a rotating spectacle plate. Moreover, they have a simple yet durable design that permits long lasting service life. This type of valve is ideal for operations where positive shut off is necessitated, such as in petroleum industries.
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