Wholesale Flange Connection Diaphragm Pressure Gauge Factory, Manufacturers

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Product Introduction

Precision instrumentation engineered for flange connection diaphragm pressure gauge applications

The Flange Connection Diaphragm Pressure Gauge uses a flanged diaphragm seal to mount directly to a tank, reactor, or pipeline nozzle. Instead of a narrow threaded port, the seal presents a large flat diaphragm flush with the process wall, so there is no cavity where product can stagnate, solidify, or harbor bacteria. This flush-face geometry is essential for viscous fluids, fibrous pulps, sanitary liquids, and any low-pressure measurement where a small threaded diaphragm would lack sensitivity.

Flange connections follow the same class and standard as the process line, typically ASME B16.5 Class 150 or 300 in 1-1/2 to 4 inch sizes, or DIN/EN PN16 to PN40 in DN25 to DN100. Because the diaphragm area is much larger than a threaded seal, the gauge can resolve very low pressures — down to a few kilopascals in large-diameter versions — with minimal fill volume and low temperature error. Bolted flange sealing also means the assembly can be installed and removed with standard pipefitting tools and gaskets.

Every flanged seal is fabricated and vacuum-filled in our 100,000-level clean workshop, where the diaphragm is welded to the flange face and leak tested before fill. Flange standard, diaphragm material, fill fluid, and calibration data are stored in our Advanced MES digital tracking system against each serial number, allowing maintenance teams to identify the exact seal specification when ordering spares.

The gauge can be direct-mounted on the seal for compact installations or connected through a flexible capillary for hot, cold, or hard-to-reach nozzles, keeping the dial at eye level and away from vibration and heat. Extended diaphragm designs, where the diaphragm sits at the end of a tube inserted into the vessel, are available for thick-walled tanks and insulation.

Core Advantages

Engineered for reliability where it matters most

DN25–DN100

Common Flange Sizes

PN16–PN40

DIN/EN Pressure Classes

Class 150/300

ASME Flange Options

Flush Large-Area Diaphragm — No pocket ahead of the diaphragm for solids, bacteria, or crystals to collect
Flange Matched to Process Line — ASME and DIN/EN flange standards let the seal bolt into standard nozzles with standard gaskets
Low-Pressure Sensitivity — Large diaphragm area resolves very small pressures with minimal fill volume
Direct or Capillary Mount — Choose compact direct mounting or a flexible capillary to place the dial at a convenient location
Extended Diaphragm Option — Diaphragm can be positioned at the end of an extension to reach through insulation or thick vessel walls
MES Traced Production — Serial-linked quality data from raw material to shipment for full after-sale traceability

Specifications

Standard technical parameters

Dial Size	100mm (4"), 150mm (6")
Accuracy Class	Class 1.6 Full Scale
Pressure Range	0-25 kPa to 0-40 Bar
Flange Standards	ASME B16.5 Class 150/300; EN 1092-1 PN16/PN25/PN40
Flange Sizes	1-1/2", 2", 3", 4" / DN40, DN50, DN80, DN100
Diaphragm	316L SS, Hastelloy, PTFE-Lined, or Tantalum
Fill Fluid	Silicone Oil, Glycerin, or Food-Grade Oil
Mounting	Direct Mount or Capillary 1-10 m
Extension Length	0, 50, 100, 150 mm Optional
Case	304/316L SS, Liquid Filled

Technical Summary

Order & production details

MOQ	50 Pieces (Standard Flange Models)
Lead Time	30-40 Days
Packaging	Wooden crate or heavy carton with flange face protection
Certifications	ISO9001:2015, CE, RoHS Compliant, Material Test Certificate Available
Raw Materials	316L SS Flange and Diaphragm, Hastelloy, PTFE
Customization	Flange class, size, diaphragm material, capillary length
Port of Export	Ningbo / Shanghai
Payment Terms	T/T, L/C at Sight, Western Union

Our Partners

Trusted by leading brands worldwide

Industrial Applications

Where flange connection diaphragm pressure gauge performance is mission-critical

Storage Tanks and Vessels

Reads hydrostatic or vapor pressure directly on flanged nozzles of atmospheric and low-pressure tanks

Viscous and Fibrous Process Lines

Prevents blockage on pulp, sludge, and heavy oil lines with flush-face sensing

Food, Dairy, and Beverage Processing

Flush design avoids dead legs that would trap product and bacteria

Chemical Reactors with Insulated Walls

Extended diaphragm reaches through insulation to the vessel wall

Pharmaceutical Bioprocess Vessels

Provides sanitary sensing where surface finish and cleanability matter

Technical Highlights & QC

Every unit validated for zero-defect performance

Flange Face Flatness Check: Flange sealing faces are inspected for flatness and finish to ensure gasket sealing.
Diaphragm Weld Leak Test: Diaphragm-to-flange welds are leak tested before fill to confirm integrity.
Vacuum Fill Verification: Seal systems are filled under vacuum and checked for air pockets that could cause error.
Capillary Flex and Kink Check: Capillary-connected units are cycled to confirm no kinking or fill loss.
Low-Range Sensitivity Test: Low pressure versions are tested to confirm response at the bottom of the range.
MES Serial Tracking: Flange standard, diaphragm material, and calibration data are stored digitally against each unit's serial number.

Environment & Media Compatibility

Engineered for demanding operating environments

Low Pressure Tank Service: Large diaphragm gives usable resolution on tanks operating only slightly above atmospheric pressure.
Hygienic Process Areas: Flush face and smooth finish support cleaning regimes in food and pharma plants.
Hot Vessel Nozzles: Capillary and extended diaphragm options keep the dial away from radiant heat.
Insulated Vessel Walls: Extension tube allows the diaphragm to reach the process through thick insulation.
Vibration on Pump Discharge: Capillary mounting isolates the dial from nozzle vibration.
Abrasive Slurries: Wide flush diaphragm avoids narrow ports that abrasive solids would erode.

Pro Tips for Longevity

Installation & maintenance best practices

Match Flange Class to the Line: Confirm the flange standard, class, and facing with your piping specification before ordering.
Use the Correct Gasket: Fit a gasket compatible with both the media and the diaphragm material; avoid overtightening bolts.
Do Not Touch the Diaphragm: Keep tools and hands away from the diaphragm surface during installation.
Secure the Capillary: Support capillary runs at intervals and avoid tight bends.
Correct for Elevation: When the dial is above or below the seal, allow for the hydrostatic head of the fill liquid.
Verify Zero After Installation: Check zero at atmospheric pressure after fitting before commissioning.

Payment & Logistics

Reliable global supply chain from factory to your site

Flexible Payment Terms: We support T/T (30% deposit, balance before shipment), L/C at sight for large orders, and secure B2B trade assurance platforms for new customers.
Global Freight Options: Sea freight from Ningbo or Shanghai for bulk orders; DHL, FedEx, or UPS air express for urgent sample and small-batch shipments.
Flange-Face Protection Packaging: Each flanged seal ships with a protective cover over the diaphragm face and sealing surfaces in a crate or heavy carton.
Full Export Documentation: Commercial invoice, packing list, certificate of origin (CO), material test certificate, and CE declaration of conformity provided with every shipment.
Sample Lead Time: Standard flange samples are available in 15-20 working days depending on class and size.
After-Sales Support: Our technical team provides flange drawings, gasket guidance, and elevation correction data.

About Us

Zhoushan Jiaerling Meter Co., Ltd. — 20 years of precision manufacturing

Zhoushan Jiaerling Meter Co., Ltd. was established in 2004. It is China Flange Connection Diaphragm Pressure Gauge Manufacturers and Wholesale Flange Connection Diaphragm Pressure Gauge Factory, which is a high-tech enterprise integrating design, research and development, manufacturing, import and export trade.

The company is located in Zhoushan City, Zhejiang Province, covering an area of 15,000 square meters, equipped with a 100,000-level clean workshop, conventional production and assembly workshop, automated production workshop, new laboratory and comprehensive office building.

After more than 20 years of hard work and development, the company has a stable design and development, production team, and advanced production and testing equipment. The company specializes in the production of various types of pressure gauges with complete specifications, and the annual output of pressure gauges reaches 6 million. In order to further develop, the company not only seeks improvement in technology, but also pays more attention to product quality and after-sales service. The company's purpose is to "regard quality as life, survive by reputation, promote development by technology, and serve customers with high-quality brands". The products are sold all over the world and are well received by domestic and foreign customers.

In 2019, the company participated in the compilation of the standard T/CECS10012-2019 "Gas Heating Hot Water Boiler and Water Heater Water Circuit Components" of the China Engineering Construction Standardization Association.

Under the implementation of modern and digital enterprise management, the company has successfully introduced the advanced MES system in 2023, and the order process is fully visualized to track data, ensuring the continuity of production and improving production efficiency.

The company will continue to adhere to the principles of excellence, accuracy, reliability, continuous improvement, and meeting customer needs, hoping to share harmony and prosperity with friends across the country.

Honor

Certifications and proprietary achievements

High-Tech Enterprise

Proprietary

Frequently Asked Questions

Everything you need to know before specifying or ordering

Why choose a flanged seal instead of a threaded seal?

A flanged seal offers a larger, flush diaphragm that suits low pressure, viscous, and hygienic media, and bolts into standard nozzles.

Which flange standards are available?

ASME B16.5 Class 150 and 300 and EN 1092-1 PN16, PN25, and PN40 are standard; others on request.

Can it measure very low pressure?

Yes, large diaphragm versions can resolve pressures as low as a few kilopascals.

What is an extended diaphragm?

It is a diaphragm mounted at the end of a tube so it can reach through insulation or thick vessel walls.

Should I use direct mount or capillary?

Direct mount is compact; capillary is better for hot, cold, or vibrating nozzles or when the dial must be at eye level.

Do I need to correct for elevation?

Yes, when the gauge is not at the same level as the seal, the fill liquid head introduces a zero offset.

Which diaphragm material do I need?

316L suits many liquids; Hastelloy, tantalum, or PTFE-lined options are available for aggressive media.

Is it suitable for sanitary use?

Flush faces and food-grade fill options are available; tell us your hygiene standard.

How is it sealed to the nozzle?

With a standard gasket between the flange faces, as with any flanged joint.

How long is the lead time?

Typically 30-40 days depending on flange size and diaphragm material.