In industrial water treatment, pure water production, wastewater reuse, and various fluid purification processes, the filter housing is not merely a vessel that holds filter cartridges – it is the "central hub" that determines whether the entire filtration system operates stably, efficiently, and safely. A well-designed housing should provide operators with clear status feedback and incorporate convenient maintenance features. Hangzhou Shuidun Technology Co., Ltd., drawing on years of design and manufacturing experience in the water treatment industry, proudly presents its Filter Housing with Pressure Gauge & Air Release Valve. This product integrates the core filtration function with two practical features – real-time pressure monitoring and automatic/manual air venting – offering a more intelligent, safer, and more efficient solution for industrial and commercial fluid treatment.
Key Features: More Than Containment – Monitoring and Maintenance
1. Integrated Pressure Gauge: The "Dashboard" of System Operation
Pressure differential is the most intuitive and reliable indicator of filter cartridge status.
Real-Time Differential Pressure Display: This product integrates a high-quality liquid-filled or dry pressure gauge at the inlet and outlet (or on top of the housing). Operators can read the pressure values at both points at a glance and calculate the differential pressure (ΔP).
Intelligent Change-Out Indication: When the differential pressure rises to a preset warning value (typically 1.5 – 2.0 bar), it indicates that the filter cartridge is clogged and requires cleaning or replacement. Compared to relying on experience or fixed time intervals, the pressure gauge provides an objective, quantifiable basis for change-out – avoiding waste from premature replacement or risks from delayed replacement (reduced flow, cartridge rupture).
System Diagnostic Tool: Pressure gauge readings also help diagnose system faults. For example, low inlet pressure may indicate insufficient upstream water supply or a partially closed valve; low outlet pressure may indicate a downstream pipe blockage. This makes troubleshooting simple and direct.
2. Built-in Air Release Valve: Eliminates Air Locks and Protects Cartridges
When a filter is started up or refilled after system maintenance, air easily remains trapped inside the housing, forming "air pockets" or "air locks."
Manual/Automatic Air Release: This product features a brass or stainless steel air release valve (commonly called a "bleed valve") at the highest point of the top cover. When filling the system, the valve can be easily opened to bleed trapped air from the housing until a continuous stream of water flows out.
Eliminates Water Hammer: Trapped air, when struck by high-pressure water flow, can cause violent "water hammer" effects – generating tremendous impact forces that can deform or rupture filter cartridges or even crack housing welds. The air release valve prevents this destructive phenomenon, protecting both the expensive cartridges and the housing itself.
Prevents Dry Running and Oxidation: For filters located downstream of pumps, trapped air can also cause pump dry running or accelerate oxidation/corrosion of metal components. Effective air venting is a basic prerequisite for long-term, stable system operation.
3. Rugged Construction and Materials
Based on Shuidun Technology's deep understanding of industrial environments, this product is meticulously designed in its structure as well.
High-Quality Stainless Steel Construction: The housing body is made of 304 or 316L stainless steel. 304 stainless steel is suitable for most potable water and general industrial water treatment applications. 316L stainless steel, with added molybdenum, offers superior resistance to chloride corrosion – making it ideal for seawater, high-salinity water, and chemical solutions.
High-Strength Clamp or Flange Connections: Depending on operating pressure and size, the housing uses either clamp (quick-opening) or flange connections. Clamp design allows tool-free, rapid opening for easy cartridge changes; flange connections are suitable for high-pressure (e.g., above 10 bar) or large-diameter housings, ensuring absolute sealing reliability.
Polishing and Corrosion Protection: The internal surface can be mechanically polished or electropolished upon request – reducing surface roughness, minimizing contaminant adhesion, and facilitating cleaning. The external surface can be mirror-finished or brushed, providing aesthetic appeal and corrosion resistance.
Safety Design: All housings are designed in accordance with pressure vessel safety standards and are equipped with safety relief valves or burst-proof bolts to ensure safe pressure relief in case of unexpected overpressure, protecting operator safety.
4. Broad Filter Cartridge Compatibility
Standard Interfaces: Internal design complies with DOE (double open end) or SOE (single open end, with 222/226 adapters) standard industrial filter cartridge interfaces, compatible with the vast majority of PP melt-blown, wound, pleated, and activated carbon fiber cartridges on the market.
Flexible Sizing: Accommodates cartridge lengths from 5 inches to 40 inches, and can be configured with 1, 2, 3, or multiple cartridges in parallel (e.g., 3-round, 5-round, 7-round, 9-round housings) – suitable for everything from small laboratory equipment to high-flow industrial systems.
Technical Specifications (Typical Values)
| Parameter | Typical Range / Options | Remarks |
|---|---|---|
| Housing Material | SS304 / SS316L Stainless Steel | CS carbon steel with rubber lining also available |
| Max. Operating Pressure | 6 bar / 10 bar / 16 bar | Depends on model and connection type |
| Max. Operating Temperature | 80°C (standard) / 150°C (high-temp version) | Depends on seal material |
| Connection Size | 3/4″ – 6″ (threaded or flanged) | Standard or custom |
| Pressure Gauge Range | 0-6 bar / 0-10 bar / 0-16 bar | Dry or liquid-filled, 2.5" or 4" dial |
| Air Release Valve | 1/4″ or 1/2″ brass/stainless steel bleed valve | Pressure- and corrosion-resistant |
| Seal Material | EPDM / NBR / Viton (FKM) / PTFE | Selected based on fluid chemical compatibility |
| Cartridge Interface | DOE (double open end) / SOE (222/226) | Accepts standard cartridges |
| Surface Finish | Mechanical polish / Electropolish / Passivation | Electropolish available for internal surface |
| Certifications | ISO9001-2008, National Drinking Water Hygiene Safety Permit | Meets drinking water and industrial standards |
Application Fields: Covering a Wide Range of Fluid Treatment Scenarios
The filter housing with pressure gauge and air release valve is a universal component for various fluid treatment systems. Specific applications include:
Industrial Water Treatment: Used as a pre-filter for RO reverse osmosis systems to protect high-pressure pumps and RO membranes. The pressure gauge indicates cartridge change-out; the air release valve ensures pumps do not run dry.
Drinking Water & Beverage Industry: Used for final or process filtration in bottled water, purified water, and beverage production lines. The air release valve ensures no air bubbles are introduced into the product.
Chemical & Electronics Industry: Used to remove particulate impurities in plating solutions, chemical solutions, high-purity chemicals, and electronic-grade ultra-pure water circulation systems. 316L material and PTFE seals ensure chemical compatibility.
Oil & Gas: Used in water injection systems, amine filtration, produced water reuse, etc. High-pressure design and excellent corrosion resistance meet demanding requirements.
Municipal & Commercial Facilities: Used for media filtration or activated carbon filtration in hotels, swimming pools, and secondary water supply systems for residential communities. Clamp-type quick-opening housings facilitate on-site maintenance.
Installation and Operation Notes
Vertical Installation: The housing should be installed vertically, with the inlet at the bottom and outlet at the top, allowing air to naturally rise to the air release valve at the top.
Initial Venting: When first filling with water or after changing cartridges, slowly open the inlet valve while simultaneously opening the air release valve to bleed internal air. Close the air release valve only after a continuous stream of water exits, then fully open the inlet valve.
Monitor Differential Pressure: Develop a habit of regularly recording pressure gauge readings. When differential pressure exceeds 1.5-2.0 bar, the filter cartridge should be replaced promptly.
Freeze and Heat Protection: Avoid exposing the housing to freezing conditions (which may cause rupture) or operating it above the specified temperature.
Seal Replacement: Each time you open the cover to change cartridges, inspect and it is recommended to replace the top cover O-ring to ensure sealing performance.
Conclusion
Hangzhou Shuidun Technology Co., Ltd.'s Filter Housing with Pressure Gauge & Air Release Valve cleverly integrates three major functions – filtration, monitoring, and venting – into a single unit. It is no longer a passive pressure vessel, but has evolved into an active component that provides status feedback, ensures operational safety, and facilitates maintenance.
By choosing this product, your fluid treatment system gains:
A Pair of Eyes: The pressure gauge makes cartridge status transparent, converting experience-based management into data-driven management.
A Safety Valve: The air release valve eliminates all hazards caused by trapped air.
A Guarantee: Shuidun Technology's commitment to quality and focus on technology.
Whether for a new water treatment project or upgrading an existing system, this filter housing will be a trustworthy choice. We offer comprehensive customization services from design and material selection to manufacturing. Please contact the Shuidun Technology sales and technical team for a tailored solution.
