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Diaphragm Thread Pressure Gauge

Diaphragm thread pressure gauge is an industrial instrument using a flexible metal or plastic diaphragm to measure fluid pressure, isolating the gauge internals from corrosive, dirty, or hot media, featuring a threaded connection (like NPT) to screw directly into a process line for reliable low-pressure readings in harsh environments like chemical, food, or oil & gas industries, offering high accuracy and overload protection.

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Product Description

Key Features & Function

Isolation: The diaphragm acts as a barrier, preventing the measured fluid from entering the gauge mechanism.
Connection: A threaded end (e.g., 1/2" NPT) screws into a pipe or tank, allowing direct connection.
Mechanism: Fluid pressure deforms the diaphragm, which pushes a rod connected to the gauge's internal movement, indicating pressure on the dial.
Media Compatibility: Uses specialized materials (PTFE, Hastelloy, Stainless Steel) for diaphragm and housing to resist aggressive fluids, high temps (up to 400°C), or sticky substances.
Applications: Ideal for chemical, petrochemical, food processing, water treatment, and power industries where standard gauges fail due to harsh conditions or clogging.

Types & Variations

Threaded Connections: Available in various sizes (1/4" to 1") and types (NPT, BSP).
Materials: Diaphragms can be PTFE, Stainless Steel (316L), Viton; housings in Stainless Steel, PP, PVC.
Connections: Can be threaded, flanged, or sanitary (clamp).

Benefits

Corrosion Resistance: Protects the gauge from damaging media.
Overload Protection: The diaphragm can support itself against the housing, preventing damage.
Wide Temperature Range: Handles higher temperatures than many other gauge types.
High Accuracy: Good for low-pressure, sensitive measurements due to the large surface area of the diaphragm.