Designed specifically for corrosive and ultra-pure applications, this diaphragm seal features a PP glass fiber-reinforced upper housing and a choice of PP, PVC, or PVDF lower housing. The use of PTFE-coated EPDM diaphragms as a standard ensures high resistance to chemical attack and temperature extremes. The fully non-metallic wetted parts eliminate the risk of contamination and provide superior compatibility with fluids like sulfuric acid, hydrochloric acid, and demineralized water. It effectively isolates pressure or vacuum instruments to extend their service life and maintain accurate readings. This seal is ideal for chemical dosing skids, filtration systems, and deionized water lines.

• 100% non-metallic wetted construction
• Highly resistant to aggressive and corrosive media
• PTFE-coated EPDM diaphragm for added chemical compatibility
• Ideal for ultra-pure applications
• Reduces instrument wear and risk of contamination

The Noshok Type 12 Diaphragm Seal features a non-replaceable, flush-mount diaphragm ideal for sanitary processes. All wetted parts are electropolished to 32 µRa or better, meeting strict hygienic standards. The 316 stainless steel all-welded housing provides superior corrosion resistance and mechanical strength. This seal supports pipe connections from 1-1/2” to 3” and can be remote-mounted using optional capillaries or cooling elements for high-temperature applications. It is critical to select a fill fluid compatible with the process media to ensure stability and accuracy.

• Sanitary ASME-BPE compliant design
• Electropolished wetted parts for superior cleanliness
• Flush diaphragm for clean-in-place (CIP) and easy sterilization
• All-welded 316 SS for durability and chemical resistance
• Optional cooling elements and capillaries available

This non-replaceable diaphragm seal features a front flush diaphragm that eliminates entrapment points, making it ideal for applications involving slurries, viscous fluids, or crystallizing media. The seal is constructed with a 316 stainless steel housing and diaphragm for long-term strength and corrosion resistance. It is available with instrument connections in 1/4” and 1/2”, and process connections from 1/2” NPT male up to 2” NPT male. Capillaries and cooling elements are optional for use in high-temperature systems. For accurate performance and safety, it is essential to select a fill fluid compatible with the process media.

• Flush diaphragm prevents clogging and build-up
• Strong and corrosion-resistant 316 SS construction
• Supports a wide range of threaded NPT process connections
• Compatible with capillaries and cooling elements
• Reliable isolation for pressure measurement instruments

The Noshok Type 29 Diaphragm Seal features a larger diameter diaphragm, enabling greater volumetric displacement to drive remote-mounted pressure instruments via capillary lines. Its robust, all-metallic, all-welded design eliminates the need for gaskets or o-rings, enhancing seal integrity under harsh conditions. Available in various material configurations for diaphragm and housing, it adapts well to corrosive, high-viscosity, or high-temperature fluids. Optional flushing ports allow cleaning of wetted areas without disassembly, minimizing downtime and buildup. Capillaries and cooling elements can be added for process environments with elevated temperatures.

• High volumetric displacement for accurate remote readings
• All-metallic welded construction – no o-rings or gaskets
• Compatible with a wide range of aggressive or viscous media
• Optional flushing port for in-place maintenance
• Supports capillary and cooling accessories for demanding conditions

Noshok’s Type 30/30H Diaphragm Seals feature a bolted, non-replaceable design with a welded diaphragm that allows for convenient replacement of the lower housing without breaking the seal system. This makes them an excellent choice for applications that demand reliable isolation and easy maintenance in the field. A wide range of instrument and process connections are available, offering flexibility for integration with various systems. Optional flushing ports help clean wetted areas and prevent buildup from clogging the diaphragm. Capillaries and cooling elements are also available for high-temperature processes, ensuring long-term protection of sensitive pressure instruments.

• Welded diaphragm with field-replaceable lower housing
• Wide compatibility with process and instrument connections
• Rugged design for high-pressure and demanding environments
• Optional flushing port for cleaning without disassembly
• Supports remote mounting with capillary and cooling options

Noshok’s Type 30L Diaphragm Seal is purpose-built for reduced pressure systems where standard metal seals would degrade due to harsh chemical exposure. It features a welded metallic diaphragm and upper housing paired with a non-metallic lower housing, providing both durability and chemical compatibility. The design supports remote pressure instrument mounting via capillaries and maintains a continuous seal even during lower housing replacement. Its bolted construction ensures a secure fit while allowing maintenance access. This seal is a smart choice for chemical processing, water treatment, and other corrosive service environments.

• Corrosion-resistant non-metallic wetted parts
• Welded diaphragm and bolted housing for structural integrity
• Field-replaceable lower housing without system interruption
• Compatible with remote mounting setups using capillary lines
• Reliable isolation for low-pressure, high-corrosion applications

The Noshok Type 25/25H Standard & Elevated Pressure Non-Replaceable Diaphragm Seals are engineered to isolate gauges, transmitters, and other pressure instruments from harmful process media. Constructed with an all-welded, all-metallic housing, these seals prevent leakage and provide enhanced durability in corrosive and viscous fluid conditions. Suitable for gauges with dial sizes of 2-1/2" and smaller and pressure ranges no less than 100 psig, they are available in multiple housing and diaphragm materials to match specific process requirements. Optional flushing ports allow easy cleaning and maintenance, while capillaries and cooling elements support elevated process temperature applications. Designed with a focus on compatibility, these seals ensure accurate and long-lasting pressure measurement performance.

• Chemical and petrochemical processing
• Food and beverage manufacturing
• Pharmaceutical and biotech production
• Pulp and paper industries
• Oil and gas refineries

• Design: Standard & elevated pressure, non-replaceable diaphragm seals
• Gauge Compatibility: For gauges with dial sizes 2-1/2" and smaller, pressure ranges ≥ 100 psig
• Housing/Diaphragm Materials: Various options available to suit applications
• Construction: All-welded, all-metallic housing
• Optional Features: Flushing port, capillaries, and cooling elements for elevated temperature
• Fill Fluid: Must be compatible with process media (e.g., avoid glycerin with strong oxidizers such as chlorine, oxygen, peroxide, nitric acid)

• Protects instruments from corrosive, viscous, or clogging process media
• All-welded metallic design eliminates leak paths for enhanced safety
• Available in a range of materials for maximum compatibility
• Optional flushing port for easy cleaning and reduced downtime
• Supports elevated temperature applications with capillaries and cooling elements