✅ Professional Stainless Steel Differential Pressure Gauge Manufacturer in China
We are a professional manufacturer of stainless steel differential pressure gauges for EPC projects, power plants, petrochemical, oil & gas, metallurgy, water treatment, and industrial process control applications. A stainless steel differential pressure gauge is an instrument that measures the pressure difference between two points in a system, displaying the differential value on a dial. It features dual independent measuring systems (typically two Bourdon tubes or two波纹管) with all-stainless steel construction — including housing, internal mechanisms, and wetted parts — providing excellent corrosion resistance, durability, and reliability in harsh environments. Our product portfolio includes CYW-150B series stainless steel differential pressure gauges, YCSH series corrosion-resistant differential pressure gauges, dual-diaphragm differential pressure gauges, and customized configurations. All products comply with GB/T 1226-2017, EN837-3, and IEC 61518 standards, available in a wide range of differential pressure ranges, static pressure ratings, and process connections for diverse project requirements[reference:0][reference:1].
A stainless steel differential pressure gauge measures the pressure difference (ΔP = P+ − P−) between two separate pressure inputs[reference:2]. It typically features two independent measuring systems — each with its own pressure inlet, sensing element (Bourdon tube or波纹管), and pointer[reference:3][reference:4]. One pointer (usually red) indicates the positive pressure (P+), and the other (usually black) indicates the negative pressure (P−). The differential value can be read directly from the angle between the two pointers or calculated from the individual readings[reference:5]. Key features include:
| Feature | Description |
|---|---|
| Dual Independent Measuring Systems | Two separate Bourdon tubes or波纹管, each with independent pressure inlet and pointer[reference:6] |
| All-Stainless Steel Construction | Housing, internal mechanism, and wetted parts made from 304 or 316L stainless steel[reference:7] |
| Superior Corrosion Resistance | Withstands corrosive media and harsh environments; ideal for chemical, petrochemical, and marine applications[reference:8] |
| Dual Pointer Display | Red pointer for P+ (positive pressure), black pointer for P− (negative pressure); differential value read from pointer angle or calculation[reference:9] |
| High Static Pressure Capability | Static pressure up to 40 bar (4MPa) or higher[reference:10][reference:11] |
| Wide Differential Pressure Range | From 1.6 kPa up to 10 MPa, covering diverse application requirements[reference:12][reference:13] |
| High Accuracy | Accuracy grades: 1.0% or 1.6%[reference:14][reference:15] |
| Wide Dial Size Range | Available in 100mm, 150mm, and 160mm diameters[reference:16][reference:17] |
| Multiple Process Connections | M20×1.5, NPT 1/2, G1/2B, and custom threads[reference:18][reference:19] |
| Wide Temperature Range | -40°C to +70°C ambient; optional low-temperature version down to -70°C[reference:20][reference:21] |
| Multiple Mounting Options | Radial direct mount, parallel connection (compatible with 3-valve manifolds), and angled connection[reference:22] |
| International Standards Compliance | GB/T 1226-2017, EN837-3, IEC 61518 certified[reference:23][reference:24] |
| Parameter | Specification Range |
|---|---|
| Standards | GB/T 1226-2017, EN837-3, IEC 61518[reference:25][reference:26] |
| Accuracy Grades | 1.0%, 1.6%[reference:27][reference:28] |
| Dial Diameters | 100mm, 150mm, 160mm[reference:29][reference:30] |
| Housing Material | 304 Stainless Steel (SUS304)[reference:31] |
| Wetted Parts Material | 304 / 316 / 316L Stainless Steel[reference:32][reference:33] |
| Sensing Element | Two Bourdon tubes / Two波纹管 (bellows)[reference:34] |
| Differential Pressure Range | 0~1.6 kPa to 0~10 MPa[reference:35][reference:36] |
| Static Pressure (Max.) | Up to 40 bar (4 MPa)[reference:37][reference:38] |
| Overload Safety | Up to 4 MPa (full welded measuring chamber)[reference:39] |
| Process Connection | M20×1.5, NPT 1/2, G1/2B, parallel or angled[reference:40][reference:41] |
| Mounting Type | Radial direct mount, parallel (compatible with 3-valve manifold), angled[reference:42] |
| Ambient Temperature | -40°C ~ +70°C (standard); -70°C ~ +60°C (low-temperature version)[reference:43][reference:44] |
| Medium Temperature | ≤60°C (standard); ≤100°C (high-temp version)[reference:45][reference:46] |
| Vibration Resistance | V.H.3 (dry); V.H.4 (liquid-filled)[reference:47] |
| Filling Medium (Optional) | Glycerin, Silicone oil, Fluor oil[reference:48] |
| Ingress Protection | IP45, IP54, IP65[reference:49][reference:50] |
| Weight (150mm) | Approx. 1.5 kg[reference:51] |
| Application | Power plants, petrochemical, oil & gas, metallurgy, water treatment, filter monitoring, pump control, EPC projects[reference:52] |
* Custom specifications are available upon request for EPC project tenders.
| Model | Dial Diameter | Differential Pressure Range | Static Pressure | Connection |
|---|---|---|---|---|
| CYW-150B | 150mm | 0~10 kPa to 0~2.5 MPa[reference:53] | Up to 10 MPa[reference:54] | M20×1.5 / NPT 1/2[reference:55] |
* Standard differential pressure ranges include: 0~10, 16, 25, 40, 60, 100 kPa; 0~0.16, 0.25, 0.40, 0.60, 1.0, 1.6, 2.5 MPa[reference:56]
| Model | Type | Dial Diameter | Pressure Range |
|---|---|---|---|
| YCS | Standard | 100mm | 0.16~10 MPa[reference:57][reference:58] |
| YCSH | Corrosion-Resistant | 100mm | 0.16~10 MPa[reference:59][reference:60] |
* YCSH features all-stainless steel wetted parts for corrosive media applications[reference:61]
| Feature | Specification |
|---|---|
| Design | Complies with EN837-3[reference:62] |
| Standard Diameter | 100mm[reference:63] |
| Accuracy | 1.0% or 1.6%[reference:64] |
| Differential Pressure Range | 0~1.6 kPa to 0~2.5 MPa[reference:65] |
| Static Pressure | Up to 4 MPa[reference:66] |
| Overload Safety | Up to 4 MPa (full welded measuring chamber)[reference:67] |
| Protection Level | IP54 (dry) / IP65 (liquid-filled)[reference:68] |
| Application Condition | Recommended Model | Reason |
|---|---|---|
| Corrosive media / Chemical processing | YCSH / CYW-150B (316L) | All-stainless steel wetted parts[reference:69] |
| Filter monitoring / Differential pressure across filters | CYW-150B | Wide differential range, high static pressure[reference:70] |
| High vibration / Pulsating pressure | Liquid-filled version | Glycerin/silicone oil damping, V.H.4 vibration resistance[reference:71] |
| Low differential pressure (≤10 kPa) | Dual-diaphragm (EN837-3) | Sensitive波纹管 design for low ΔP[reference:72] |
| Extreme low temperature environment | Low-temperature version | Operates down to -70°C[reference:73] |
| High static pressure (>4 MPa) applications | CYW-150B (High static) | Static pressure up to 10 MPa[reference:74] |
Q1: What is a stainless steel differential pressure gauge?
A: A stainless steel differential pressure gauge is an instrument that measures the pressure difference between two points in a system. It features two independent pressure inlets (P+ and P−) and two separate measuring systems (typically Bourdon tubes or波纹管). The differential value (ΔP = P+ − P−) is displayed on a single dial, with one pointer indicating P+ and the other indicating P−[reference:75][reference:76].
Q2: How does a stainless steel differential pressure gauge work?
A: The gauge contains two independent measuring systems — each with its own pressure inlet, sensing element (Bourdon tube or波纹管), and pointer[reference:77]. When pressure is applied to each inlet, the respective sensing element deforms, and the mechanical movement is transmitted through gear mechanisms to two pointers on the same dial[reference:78]. The red pointer shows P+ (positive pressure), and the black pointer shows P− (negative pressure). The differential pressure can be read directly from the angle between the two pointers or calculated as ΔP = P+ − P−[reference:79].
Q3: What is the difference between a differential pressure gauge and a standard pressure gauge?
A: A standard pressure gauge measures the pressure at a single point relative to atmospheric pressure. A differential pressure gauge measures the pressure difference between two separate points in a system. Differential pressure gauges have two pressure inlets and two independent measuring systems, while standard gauges have one inlet and one measuring system[reference:80].
Q4: What are the main types of stainless steel differential pressure gauges?
A: The main types include: Bourdon tube type — two independent Bourdon tubes, suitable for medium to high differential pressures; Diaphragm/波纹管 type — two波纹管, suitable for low differential pressures (as low as 1.6 kPa)[reference:81][reference:82]; Dual-diaphragm type — complies with EN837-3, all-welded measuring chamber[reference:83]; and Liquid-filled type — glycerin or silicone oil filled for vibration and pulsation damping[reference:84].
Q5: What is the difference between CYW-150B and YCSH differential pressure gauges?
A: CYW-150B is a stainless steel differential pressure gauge with a 150mm dial, offering differential pressure ranges from 10 kPa to 2.5 MPa and static pressure up to 10 MPa[reference:85]. YCSH is a corrosion-resistant differential pressure gauge with all-stainless steel wetted parts, designed specifically for corrosive media applications[reference:86]. Both are available with 304 or 316L stainless steel construction.
Q6: What standards do your stainless steel differential pressure gauges comply with?
A: Our differential pressure gauges are manufactured in compliance with GB/T 1226-2017 (Chinese national standard for general pressure gauges), EN837-3 (European standard for differential pressure gauges with diaphragm elements), and IEC 61518[reference:87][reference:88].
Q7: What accuracy grades are available?
A: We offer two accuracy grades: 1.0% (premium grade for critical applications) and 1.6% (standard grade for most industrial applications)[reference:89][reference:90].
Q8: What differential pressure ranges are available?
A: Differential pressure ranges include: Low range: 0~1.6 kPa to 0~100 kPa[reference:91][reference:92]; Medium range: 0~0.16 MPa to 0~2.5 MPa[reference:93]; High range: up to 10 MPa[reference:94].
Q9: What is static pressure and why does it matter?
A: Static pressure is the common pressure applied to both pressure inlets simultaneously. It is the system operating pressure on which the differential pressure is superimposed. Our gauges can withstand static pressures up to 40 bar (4 MPa) for standard models and up to 10 MPa for high-static versions[reference:95][reference:96].
Q10: What process connections are available?
A: Standard connections include M20×1.5 (most common), NPT 1/2, and G1/2B[reference:97][reference:98]. Connections are available in parallel configuration (compatible with 3-valve manifolds) and angled configuration for different installation requirements[reference:99].
Q11: What materials are used in stainless steel differential pressure gauges?
A: Housing: 304 stainless steel (SUS304); Wetted parts: 304, 316, or 316L stainless steel; Bourdon tubes/波纹管: 316 or 316L stainless steel; Movement: Copper alloy with stainless steel options available[reference:100][reference:101].
Q12: What is the temperature range for stainless steel differential pressure gauges?
A: Ambient temperature: -40°C to +70°C (standard); -70°C to +60°C (low-temperature version)[reference:102][reference:103]. Medium temperature: ≤60°C (standard); ≤100°C (high-temperature version)[reference:104][reference:105].
Q13: What is the vibration resistance of stainless steel differential pressure gauges?
A: Dry type: V.H.3 vibration resistance grade[reference:106]. Liquid-filled type: V.H.4 vibration resistance grade, with glycerin or silicone oil filling providing superior damping for high-vibration and pulsating pressure applications[reference:107].
Q14: What IP protection levels are available?
A: We offer multiple ingress protection levels: IP45 — standard for most industrial applications[reference:108]; IP54 — dust-protected and splash-proof[reference:109][reference:110]; IP65 — dust-tight and jet-proof (liquid-filled versions)[reference:111].
Q15: How do I select the correct differential pressure range?
A: The differential pressure range should be selected so that the normal operating ΔP falls between 1/3 and 2/3 of the full scale for optimal readability and accuracy[reference:112]. The minimum readable ΔP should be no less than 1/10 of the full scale. For pulsating pressures, use a liquid-filled gauge to dampen pointer fluctuations.
Q16: What are the typical applications of stainless steel differential pressure gauges?
A: Stainless steel differential pressure gauges are widely used in: Filter monitoring — measuring pressure drop across filters[reference:113]; Pump control — monitoring pump differential pressure[reference:114]; Liquid level measurement — in sealed tanks[reference:115]; Flow measurement — across orifice plates and venturi tubes; Power plants — condenser and heat exchanger differential pressure; Petrochemical — reactor and column differential pressure[reference:116].
Q17: What is the difference between Bourdon tube and diaphragm/波纹管 type differential pressure gauges?
A: Bourdon tube type uses two independent Bourdon tubes as sensing elements, suitable for medium to high differential pressures (0.16 MPa to 10 MPa). Diaphragm/波纹管 type uses two波纹管 (bellows) as sensing elements, suitable for low differential pressures (as low as 1.6 kPa)[reference:117][reference:118]. Diaphragm types typically offer higher overload protection and are available with all-welded measuring chambers for enhanced sealing[reference:119].
Q18: What tests are performed on stainless steel differential pressure gauges before delivery?
A: We conduct comprehensive quality tests including: (1) Accuracy test — verifying linearity and repeatability at multiple points; (2) Static pressure test — verifying both sides can withstand rated static pressure; (3) Differential pressure test — verifying accuracy across the full differential range; (4) Leak test — verifying seal integrity of both measuring systems; (5) Temperature effect test — verifying temperature compensation; and (6) Vibration test — for liquid-filled models.
Q19: Do you support EPC projects with technical documentation?
A: Yes. We provide full technical support for EPC projects, including datasheets, calibration certificates, type test reports, factory acceptance tests (FAT), material traceability documentation, and custom configurations based on project instrumentation schedules and specifications. We are a trusted partner for global EPC contractors in power, petrochemical, oil & gas, and industrial sectors.
Q20: Can you provide custom stainless steel differential pressure gauge configurations?
A: Yes. We offer fully customized stainless steel differential pressure gauge solutions including custom differential pressure ranges, static pressure ratings, dial sizes, process connections (M20×1.5, NPT, G threads), materials (304/316/316L/Hastelloy/Monel), mounting types, accuracy grades, liquid filling options, and special markings. Our engineering team works closely with EPC contractors to develop gauges that meet specific project technical requirements and process conditions.
Send your project specification, differential pressure measurement requirements, or instrumentation schedule. Our engineering team will reply with a customized solution, BOM & datasheet within 24 hours.
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