The difference between GOST standard valves and GB standard valves
Russian standard valves (GOST) and Chinese national standard valves (GB) differ significantly in standards, design, materials, and applications. Gost valves focus on durability under extreme conditions, but Chinese valves pay more attention to cost-effectiveness and broad applicability. The following comparison outlines these differences with supporting data and references.
1. Differences in the standard system and design concept
1. Different standard-setting bodies
1. Differences in the standard system and design concept
GOST standard valves, developed under GOST by Rosstandart, ensure reliability and safety in extreme conditions, such as low temperatures and high corrosion. For example, GOST 356-80 sets requirements for valves operating below -60℃.
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Chinese Standard Valves: Adopting the GB standard (China National Standard), formulated by the National Valve Standardization Technical Committee (TC31/SC3), with an emphasis on universality, mass production, and cost control, in compliance with standards such as GB/T 1048.
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data comparison ：
standard | Enabling institutions | Core design concept |
| Russian standard (GOST) | Rosstandart | Extreme environmental reliability (e.g., -60℃, high corrosion) |
| Guo Biao （GB） | National Valve Standardization Technical Committee | Universality, cost control |
2. Design parameter variations
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pressure rating ：
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The common pressure grade of Russian standard valve is PN16-PN250 (GOST 356-80), and the test method is more strict, such as requiring the pressure test at at-40℃.
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The pressure grade of the national standard valve is PN1.6-PN420 (GB/T 1048), and the test conditions are relatively loose.
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Example: The Russian standard PN25 is equivalent to the national standard PN2.5 MPa. However, the Russian standard fatigue test under high pressure must also meet GOST 9544-2015, and the Chinese national standard valves are rated PN1.6 to PN420 (GB/T 1048), with less stringent test conditions.：
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Russian standard valves are suitable for temperatures as low as-60℃, and some models (such as LNG equipment valves) can reach-196℃ (GOST 802-75).
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Russian standard valves operate at temperatures as low as -60℃, with some models, such as LNG valves, rated for -196℃ (GOST 802-75).a sheet ：
parameter | Russian standard (GOST) | Guo Biao （GB） |
| pressure rating | PN16-PN250 | PN1.6-PN420 |
| temperature range | -60℃ ~ 650℃ | -29℃ ~ 425℃ |
| Fatigue test cycle | ~5000 times | ~4000 times |
II. Comparison of materials and manufacturing requirements
1. Material selection
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Russian standard valve: priority is to use 12Х18Н10Т stainless steel (similar to national standard 0Cr18Ni10Ti), its low temperature impact toughness up to 100 J/cm² (-60℃), suitable for extremely cold areas.
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Chinese national standard valves mainly use 304 or 316 stainless steel (GB/T 1220), which provides strong corrosion resistance but lower low-temperature performance (impact toughness about 80 J/cm² at -29℃).
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Castings standards:
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GOST 977-88 sets casting defect limits 20% to 30% stricter than the national standard. For example, the porosity diameter must be ≤0.5mm, compared to ≤0.8mm in GB/T 12230.
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Russian standard castings must pass ultrasonic testing (GOST 24507-80), whereas the national standard typically employs visual or X-ray testing.
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Material performance comparison:
material | Russian standard (12Х18Н10Т) | National standard (304/316) |
| Low temperature impact toughness | 100 J/cm² (-60℃) | 80 J/cm² (-29℃) |
| Cast part defect diameter | ≤0.5mm | ≤0.8mm |
2. Connection and sealing
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flange connection ：
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The thickness of the Russian standard flange is 10%-15% more than that of the national standard (GOST 12815-80 vs. GB/T 9113). For example, the thickness of the DN100 Russian standard flange is 20mm, while that of the national standard is 16mm.
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The number of bolt holes also differs: the DN100 Russian standard uses 12 holes, while the national standard uses 8, which enhances anti-torque capability.
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Sealing test:
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Russian standards require 100% high-pressure helium leak detection (GOST 5583-78), with a leakage rate of less than 10⁻⁶ Pa·m³/s.
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The national standard uses hydraulic or pneumatic tests (GB/T 13927), with a leakage rate of ≤10⁻⁴ Pa·m³/s, resulting in lower costs.
III. Application scenarios and market adaptability
1. Regional adaptation
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Russian standard valves: widely used in CIS countries, Arctic oil and gas projects, and Siberian pipelines, suitable for extreme low temperatures below-50℃ and high corrosion environments. For example, Russian standard valves account for more than 70% of the Yamal LNG project.
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Chinese national standard valves are suitable for temperate climates in Asia and Africa and are widely used in the chemical, power, and municipal engineering sectors, with an over 85% market share in China.
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2. Certification and mutual recognition
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attestation ：
Russian standards require GOST-R certification, which includes low-temperature impact and environmental
adaptability tests.
Chinese national standards require GB/T certification, and some export products must also meet API 6D certification. interchangeability：
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The size of the two standards is not fully compatible. For example, the installation length of a DN50 Russian valve is 230mm, while the national standard is 210mm (see ISO 5208), so adapters or custom flanges are needed.sheet：
project | Russian standard (GOST) | Guo Biao （GB） |
| attestation | GOST-R | GB/T, API 6D |
| DN50 installation length | 230mm | 210mm |
| Market share | CIS 70 per cent | Domestic 85% |
sum up
Russian standard valves offer superior reliability and durability in bad conditions, suitable for high-risk projects like oil and gas operations. Chinese standard valves offer cost-effectiveness and a mature supply chain, Suitable for conventional industrial applications. Operators should evaluate operational conditions and use third-party institutions for standard conversion. Consulting the latest GOST and GB standards is recommended to ensure compatibility.
reference material
1. GOST 356-80: Valves for Pipelines – General Technical Requirements. Link
2.GB/T 1048-2005: Piping Components – Nominal Pressure. Link
3.GOST 977-88: Steel Castings – General Specifications. Link
4.GB/T 12230-2005: General Purpose Industrial Valves – Cast Steel. Link
5GOST 12815-80: Flanges for Valves and Fittings. Link
6.GB/T 9113-2010: Steel Pipe Flanges. Link
7.GOST 5583-78: Industrial Valves – Testing Methods. Link
8.GB/T 13927-2008: Pressure Testing of Valves. Link
9.ISO 5208: Industrial Valves – Pressure Testing. Link
