A manifold is a device used in systems that measure or control the flow and pressure of liquids or gases. It helps by connecting different parts of a system and combining multiple functions into one compact unit. Instead of having lots of separate pieces (like pipes, valves, and fittings), a manifold puts everything together in one place, making the system easier to install and manage.
Here's a quick breakdown of what these specific types of PANAM Instrumentation Valve Manifolds do:
Two Valve Manifold:
This type of manifold is used for connecting pressure sensors (like gauges or transmitters) to a system. It has two valves:
- Isolation valve – This valve allows you to isolate the system, shutting it off when maintenance or testing is required.
- Vent valve – This valve enables calibration or testing of the device while it's still in place, ensuring accurate readings during operation.
By combining several functions (like valves and fittings) into one unit, it reduces the amount of space and parts you need to install, making things simpler and cleaner. It can handle high pressures and comes in different materials depending on what you're working with.
Three Valve Manifold:
While primarily used for liquids, three-valve manifolds can also be applied to gases when the differential pressure (DP) sensing instrument is not used for custody transfer. This manifold includes an additional valve known as the Equalizer Valve, which serves multiple purposes:
- It equalizes the pressure between the high and low sides of the DP measuring instrument, a process known as a zero check.
- It also plays a crucial role in the initiation and setup of the differential pressure instrument.
Five Valve Manifold
The five-valve manifold is the most advanced type, offering enhanced control and precision. It includes two Equalizer Valves (for balancing pressure), two Block Valves (for shutting off the system), and a Vent Valve located between the equalizer valves.
While many assume the vent valve is primarily for calibrating the DP instrument, its main function is actually to facilitate a double block and bleed system. By closing the equalizer valves and opening the vent valve—this is the proper setup when running—the high-pressure side is isolated from the low-pressure side, ensuring the signal integrity for the differential pressure instrument remains uncompromised.
In a nutshell:
Constructing a manifold using individual valves, nipples, unions, and tees is a labor-intensive process with numerous potential leak points. By using a single block to build the same manifold, you save time, money, weight, and reduce the risk of maintenance issues. Manifolds are essential not only for the initiation of instrumentation and calibration but also for ensuring the instrument operates as intended throughout its lifespan.
Discover Instrumentation Manifolds