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Pressure Gauge Port Extinguisher Valve

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Introduction: Valve Modification for Pressure Monitoring

The Pressure Gauge Port Extinguisher Valve refers specifically to a valve body (brass or aluminum) that has a dedicated, threaded aperture machined into it for the direct attachment of a pressure gauge indicator. This port is a universal feature on all stored-pressure extinguishers (Dry Chemical, Water, Foam) but is distinct from high-pressure CO2​ units which rely on weight checks.

The port is precision-tapped with a standardized thread (often NPT or a specialized valve thread) and positioned strategically to connect the gauge directly to the propellant gas chamber. This allows the gauge to measure the internal working pressure (typically 100 psi to 175 psi) without exposing the gauge mechanism to the extinguishing agent itself.

The integrity of this port is critical; if the threads are damaged or the gauge is improperly sealed, the unit will slowly leak its propellant, rendering the extinguisher non-functional when needed. This valve is the foundational design for the most common types of portable fire protection. (Approx. 540 words)

Advantage: Instant Status Check, Modular Design, and Precision Machining

  • Immediate Verification: Allows for the fastest and easiest method to confirm a stored-pressure unit's operational readiness.
  • Precision Fit: The port is CNC machined to ensure the gauge threads fit perfectly, minimizing the risk of pressure leaks at the connection point.
  • Modular Replacement: The gauge can be easily unscrewed and replaced during service without needing to replace the entire valve body.
  • Universal Compliance: The presence of this gauge port is a fundamental design requirement for UL-listed and EN-certified stored-pressure units.
  • Robust Seating: Designed with a smooth mating surface to ensure the gauge O-ring/washer creates a high-integrity, leak-proof seal.
  • Cost-Effective Design: Eliminates the need for separate pressure monitoring systems for the majority of fire extinguisher types.

Specification: Port Thread, Material, and Location

Component FunctionThreaded Aperture for Mounting Pressure Gauge Indicator
Valve TypeFor Stored-Pressure Extinguishers Only (ABC, Water, Foam)
Port Thread SizeM10×1, M8×1, or 1/8 inch NPT (Gauge Dependent)
Valve MaterialBrass or Aluminum Alloy
Pressure Range100 psi to 200 psi (Standard Operating Range)
Standard ComplianceUL 299/711 (Sealing Integrity), EN 3
Sealing MethodThread Sealant (Teflon Tape) and O-Ring/Washer
Key ConsiderationPrecise Threading and Smooth Seating Surface

Function in Extinguisher Readiness and Service

Monthly Visual Inspection

The port enables the user to quickly verify the unit is charged (needle in the green zone) during mandatory monthly checks.

Propellant Charging

Used during manufacturing and service recharge to monitor and verify the cylinder is filled to the correct pressure.

Leak Detection

A slow drop in the gauge reading is the first indicator of a leak through the valve seat, gauge threads, or stem seals.

Valve Disassembly

The gauge must be removed from this port before the valve can be fully disassembled for internal service (6 or 12 years).

Temperature Monitoring (Indirect)

The gauge reading through this port shows pressure fluctuations due to changes in ambient temperature.

Grow Your Bussiness With KAITUO

  • INNOVATION

    Professional R&D Team

    We have a professional R&D team of over 15 people who are able to provide innovative products and customized design services to our customers.

  • QUALITY

    Product quality assurance

    We adhere to quality as a lifeline for our business development, and strict quality management systems ISO and CE, as well as a variety of advanced quality testing equipment are our guarantees for product quality.

  • PRODUCTION CAPACITY

    Annual output exceeds 400,000

    Every month over 400,000 pcs of kinds of valves, including fire extinguisher valve, lpg valve, marine gas cylinder valve and so on.

  • SERVICE

    One-stop service

    We have complete design, and product development, testing and quality control are all carried out in the factory, which to a certain extent guarantees the high quality and performance of Kaituo fire equipment.

Payment & Shipping: Flexible Global Trade Solutions

We offer comprehensive and secure international trade terms tailored to our global clientele.

  • Accepted Payment Methods:

    Wire Transfer (T/T): Standard 30% deposit to confirm the order, 70% balance upon presentation of Bill of Lading (B/L) copy.

    Letter of Credit (L/C): Irrevocable L/C at sight for precision CNC machining and high-volume valve component orders.

  • Shipping Terms (Incoterms):

    FOB (Free On Board): Ningbo Port is our standard shipping hub.

    CIF/CFR: Available upon request; we manage shipping logistics to your designated port.

  • Packaging:

    Valve bodies are shipped with protective plastic caps over the gauge port threads to prevent damage and contamination.

Comprehensive Information Summary

Minimum Order Quantity (MOQ)10,000 Units (Aluminum), 5,000 Units (Brass)
Lead Time60-75 Days (CNC Machining, Deburring, Threading, QC Inspection)
PackagingIndividual Thread Protection, Secured in Trays/Cartons.
CertificationsUL 299/711, EN 3, ISO 9001.
Raw MaterialsBrass or Aluminum Alloy.
Customization OptionsThread Type (NPT/Metric), Port Depth, Surface Finish.

Professional Usage Tips

  1. Thread Sealant Use:

    Always apply Teflon thread sealant tape (or equivalent liquid sealant) when installing or reinstalling the gauge to ensure a high-pressure seal.

  2. Correct Torque:

    Tighten the gauge only to the manufacturer's specified torque; over-tightening can crack the gauge housing or damage the valve port threads.

  3. Gauge Compatibility:

    Ensure the replacement gauge has the correct thread type and length to seat properly without bottoming out or being too short.

  4. Visual Obstruction:

    The valve must be installed such that the gauge face in the port is always visible to the user without obstruction from the handle or bracket.

  5. Pressure Release:

    Always ensure the extinguisher is fully depressurized before attempting to remove the gauge from the port for servicing.

Get in Touch

ABOUT KAITUO
Ningbo Kaituo Valve Co., Ltd., also known as Ningbo Anke Fire Equipment Co., Ltd., is China Pressure Gauge Port Extinguisher Valve Manufacturers and Wholesale Pressure Gauge Port Extinguisher Valve Factory, specializing in the research and development, production and export of fire equipment. It owns the anke brand and a number of national high-tech patents.
Founded in 2001, our company mainly provides high-quality fire protection products for the international market, specializing in the production of various types of fire extinguisher accessories, marine gas cylinder valves, gas valves, etc. After years of hard work and continuous improvement of process reform, our products are exported to dozens of countries around the world and have won a good international reputation. All of our products have obtained the EU EN, CE certification in 2007.
Welcome all customers to call and visit us. Our company has a professional sales team to provide accurate services.
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FAQ

CO2​ extinguishers do not have a gauge port because they are readiness is measured by weight, not pressure.

Common sizes include M10×1 mm (Metric) or 1/8 inch NPT (US) depending on the gauge standard.

Thread sealant is required to fill the microscopic gaps between the threads, ensuring a complete, high-pressure seal.

A damaged thread will prevent the gauge from sealing properly, leading to a continuous slow pressure leak.

The Minimum Order Quantity (MOQ) for high-volume standard valve bodies is typically 10,000 units.

No. The port connects only to the propellant gas chamber above the agent chamber.

No. The port is strictly for the gauge; the safety burst disk (relief valve) has a separate, dedicated port or mechanism.

The extinguisher must be fully depressurized first; then, a specialized wrench or pliers is used to unscrew the gauge.

It means the extinguishing agent and the propellant gas (usually nitrogen) are stored together in the same cylinder.

The threading must be machined to a tight tolerance (e.g. Class 2B) to ensure compatibility and a secure seal.