China Flanged Diaphragm Pressure Gauge - Stainless Steel, 0–1 MPa Range | China Suppliers & Factory Suppliers, Factories

The diaphragm-sealed pressure gauge is a specialized instrument designed for accurate pressure measurement in challenging applications. Ideal for corrosive, high-viscosity media that may contain solid particles, this gauge prevents direct contact between the measuring medium and the internal components, thus avoiding blockage and corrosion. Comprising a standard pressure gauge and a diaphragm sealing device—which includes the diaphragm body, diaphragm sheet, and sealing fluid—this innovative solution is essential for various industries, including petrochemicals, metallurgy, pharmaceuticals, food and beverage, and papermaking, The functionality of the diaphragm-sealed pressure gauge relies on the principle of pressure transmission through the diaphragm's deformation. When the pressure medium interacts with the diaphragm, it causes elastic deformation. The sealing fluid, typically silicone oil or glycerin, transfers this deformation pressure to the elastic sensing element (like a Bourdon tube) inside the gauge. This process generates a precise displacement proportional to the pressure, allowing the gauge’s pointer to indicate the pressure value accurately, As leading suppliers and manufacturers in China, we take pride in providing high-quality diaphragm-sealed pressure gauges that meet industry standards and customer expectations. Our factory utilizes advanced technology and rigorous quality control, ensuring reliable performance and durability for any application. Choose our diaphragm-sealed pressure gauges for superior accuracy and reliability in your pressure measurement needs

Product Description

Product Specifications
Case Stainless steel
Size 100mm (4")
Ring (Cover) Stainless steel
Window Glass
Pointer Aluminum Alloy, Black Finished
Connection Stainless steel
Connection Location Lower
Thread 1/8", 1/4", 3/8", 1/2"; PT(BSPT, ZG), BSP(G, PF), NPT etc.
Element (Bourdon Tube) Stainless steel
Movement Stainless steel
Dial Plate White Aluminum with Black Graduations
Core Features and Advantages
🛡️ Corrosion and Clogging Prevention
The diaphragm completely isolates the measured medium from the internal components of the pressure gauge, preventing corrosive media from damaging the instrument and preventing viscous or particulate media from clogging the instrument channels.
🎯 Reliable Measurement Accuracy
Low pressure transmission loss of the sealing fluid, combined with a high-precision gauge head, enables accurate pressure measurement, typically achieving accuracy classes of 1.0 or 1.6.
🌡️ Adaptable to Complex Operating Conditions
Can operate in high and low temperature environments (compatible with different types of sealing fluids and diaphragm materials); some models can also be used for vacuum pressure measurement.
🔧 Flexible and Diverse Installation
Supports multiple installation methods including threaded connections, flange connections, and sanitary clamp connections (suitable for the food and pharmaceutical industries), adapting to different process pipelines.
Typical Application Fields
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Chemical Industry Measuring the pressure of corrosive media such as strong acids, strong alkalis, and salt solutions.
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Food & Pharmaceutical Industry Measuring the pressure of viscous media or media with high hygiene requirements such as sauces, pharmaceutical solutions, and dairy products.
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Metallurgical Industry Measuring the pressure of high-temperature melts and slurries containing particles.
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Water Treatment Industry Measuring the pressure of media containing impurities such as sewage and sludge.
? Frequently Asked Questions
Q What is the main purpose of the diaphragm in a diaphragm pressure gauge?
The diaphragm acts as a physical barrier between the measured medium and the gauge's internal components. It prevents corrosive, viscous, or particle-laden media from entering and damaging the Bourdon tube, movement, and other sensitive parts, thereby extending the service life and maintaining measurement accuracy.
Q What thread standards are available for this pressure gauge?
This gauge supports a wide range of thread standards to suit different regional and industry requirements, including PT (BSPT/ZG), BSP (G/PF), and NPT, in sizes 1/8", 1/4", 3/8", and 1/2". Please specify your required thread type when ordering.
Q What accuracy class does this pressure gauge achieve?
Thanks to the low-loss sealing fluid transmission system and high-precision gauge head, this diaphragm pressure gauge typically achieves accuracy classes of 1.0 or 1.6, making it suitable for most industrial measurement applications that require reliable and consistent readings.
Q Is this gauge suitable for use in the food and pharmaceutical industries?
Yes. The gauge supports sanitary clamp connections and is compatible with materials that meet hygiene standards. It is well-suited for measuring the pressure of viscous or hygiene-sensitive media such as dairy products, sauces, and pharmaceutical solutions where contamination must be strictly avoided.
Q Can this pressure gauge be used for vacuum pressure measurement?
Yes, certain models of this diaphragm pressure gauge are designed to handle vacuum pressure measurement. The specific capability depends on the selected diaphragm material and sealing fluid. Please consult our technical team to confirm suitability for your specific vacuum application.
Q What materials are used in the construction of this gauge, and why does it matter?
The case, ring, connection, Bourdon tube (element), and movement are all made of stainless steel, providing excellent corrosion resistance and mechanical durability. The aluminum alloy pointer with black finish ensures clear readability, while the white aluminum dial plate with black graduations offers high contrast for easy on-site reading in various lighting conditions.

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