Pressure Test Port for HEPA Filter Housings | Specifications & Verification

Product Specifications

Technical details and manufacturing context for Pressure Test Port

Definition

A pressure test port is an integral component of HEPA filter housings, providing a standardized, sealed interface for attaching manometers, pressure gauges, or digital sensors. Its primary role is to facilitate the measurement of the pressure drop (differential pressure) across the HEPA filter media. This measurement is critical for determining filter loading, verifying system integrity, and scheduling maintenance or filter replacement based on predefined pressure thresholds, ensuring continuous compliance with air cleanliness standards. The port is typically installed on the upstream (dirty) side, downstream (clean) side, or both sides of the filter housing. It features a threaded or quick-connect connection that allows for secure attachment of measurement devices without compromising the housing's seal integrity. The port is designed to withstand the operating pressure and temperature ranges specified for the housing, and its materials are selected based on the chemical compatibility with the process air or gas. Common materials include stainless steel (e.g., 304, 316), anodized aluminum, and plastics such as polypropylene or PTFE for chemical resistance. The port's connection thread sizes typically range from G1/4 to G1/2 per ISO 228-1, and with a test pressure of 1.5 to 2.4 MPa. The operating temperature range is -20 to 80°C, and the seal material can be EPDM for water or FKM for oils. The body material may be SS304 or SS316 per ASTM A276. The leakage rate at working pressure with air is ≤0.1 mL/min, and the pressure loss at rated flow is ≤0.05 MPa. The flow capacity at 0.1 MPa pressure drop is 0.5 to 2.0 m³/h, and the weight ranges from 0.2 to 0.5 kg. These values are reference ranges; actual specifications must be confirmed with the legal manufacturer or supplier for the specific model and application. The port is not a standalone product but a component that must be integrated into the housing design, and its installation and use must follow the manufacturer's instructions to ensure safety and performance.

Working Principle

The port provides a sealed, threaded, or quick-connect interface that taps into the airstream on either the upstream (dirty) side, downstream (clean) side, or both sides of the HEPA filter within the housing. When a pressure measurement device is connected, it reads the static pressure at that point. By comparing readings from ports on opposite sides of the filter, the differential pressure (ΔP) is calculated, indicating the resistance to airflow caused by the filter and accumulated particulate matter. This measurement is essential for monitoring filter loading and determining when maintenance or replacement is needed.

Common Materials

Stainless Steel (e.g., 304, 316), Anodized Aluminum, Plastic (e.g., Polypropylene, PTFE for chemical resistance)

Technical Parameters

Parameter	Typical range	Notes & selection driver
Connection Thread	G1/4–G1/2	Common sizes for pressure gauge connectionISO 228-1
Test Pressure	1.5–2.4 MPa	1.5 times working pressure for hydrostatic test
Operating Temperature	-20–80 °C	Seal material limits range
Seal Material	EPDM–FKM	EPDM for water, FKM for oils
Body Material	SS304–SS316	316 for corrosive mediaASTM A276
Leakage Rate	≤0.1 mL/min	At working pressure with air
Pressure Loss	≤0.05 MPa	At rated flow
Flow Capacity	0.5–2.0 m³/h	At 0.1 MPa pressure drop
Weight	0.2–0.5 kg	Depends on material and size

Ranges are indicative industry figures for RFQ preparation, not a supplier commitment. Confirm every value and standard with the legal manufacturer before ordering.

Components / BOM

Port Body / Fitting
Provides the main structural interface and threading for connection to the housing and measurement device.

Material: Stainless steel or anodized aluminum
Sealing Gasket / O-ring Part
Creates an airtight seal between the port body and the filter housing wall to prevent leakage.

Material: Silicone, Viton, EPDM, or PTFE
Dust Cap / Plug Part
Protects the port threads from contamination, damage, and airflow leakage when not in use.

Material: Plastic (e.g., Nylon) or metal

Applied To / Applications

This component is essential for the following industrial systems and equipment:

HEPA Filter Housing

View system integration details

Manufacturers of Pressure Test Port

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Frequently Asked Questions

What is the purpose of a pressure test port on a HEPA filter housing?

It provides a sealed access point to connect pressure measurement instruments, allowing the measurement of differential pressure across the filter. This helps monitor filter loading and determine when maintenance or replacement is needed.

What are the common connection thread sizes for pressure test ports?

Common sizes are G1/4 to G1/2 per ISO 228-1. However, the exact size depends on the specific model and must be confirmed with the manufacturer.

What materials are typically used for pressure test ports?

Common materials include stainless steel (304, 316), anodized aluminum, and plastics like polypropylene or PTFE for chemical resistance. The choice depends on the application and compatibility with the process media.

What are the operating pressure and temperature ranges for a pressure test port?

The operating temperature range is -20 to 80°C. These are reference values; always verify with the manufacturer for the specific model.

Data Basis

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Preliminary Technical Classification

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pressure:	0 to 10 bar (150 psi)
other spec:	Flow Rate: Not applicable (static measurement port), Slurry Concentration: Not applicable (clean air/gas only)
temperature:	-20°C to 120°C

Pressure Test Port

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