GOST 31294-2005 PDF

Full title and description

GOST 31294-2005 — Клапаны предохранительные прямого действия. Общие технические условия (English title: Direct-acting safety valves. General specifications). The standard establishes general technical requirements, definitions and quality criteria for direct-acting safety (relief) valves used to protect equipment from overpressure by discharging fluid to atmosphere or to a low-pressure system.

Abstract

This GOST covers direct-acting safety valves of general industrial purpose for liquid and gaseous aggressive and non‑aggressive media, specifying scope of sizes, rated pressures, temperature ranges, designation, performance parameters (set/closing/opening pressures, full-lift characteristics), testing, marking and quality requirements necessary for manufacture, testing and certification. It replaces earlier standards for similar valves and includes subsequent amendments and corrections.

General information

• Status: Active / in force (действующий). Some national catalogs list it as adopted for national application.
• Publication date: Designation year 2005; commonly recorded introduction/implementation dates include 2008 (1 Oct 2008) and national adoptions around 2009–2010 in some registers — see notes below.
• Publisher: Interstate GOST (EASC / national standards bodies), developed by Technical Committee TC 259 (Pipeline valves and bellows/valve engineering). Adopted as a GOST interstate standard and incorporated into national registries.
• ICS / categories: 23.060 (Valves).
• Edition / version: Original designation GOST 31294-2005 with later published implementation/activation records and a series of amendments/corrections (popravka and numbered changes published 2009–2021 and later).
• Number of pages: Vendor/registry listings differ: official electronic registry entry shows 32 pages, while several commercial catalogs list 43 pages — editions/formatting differ between publishers.

Scope

The standard applies to direct‑acting safety valves of general industrial application with nominal diameters from DN 10 to DN 300 (inclusive), for rated pressures up to PN 400 (inclusive), and for media temperature range from −110 °C (163 K) to 600 °C (873 K). It covers valves intended to protect equipment from accidental overpressure by discharging liquid or gas to atmosphere or to a low-pressure system; mandatory product quality requirements are given in the standard's sections on design, testing and inspection.

Key topics and requirements

• Definitions and terminology for direct‑acting safety valves (set pressure, closing pressure, full‑lift pressure, effective area, etc.).
• Design and construction categories (including two‑position and proportional safety valves and typical closure/seat arrangements).
• Rated sizes (DN 10–DN 300) and pressure ratings (up to PN 400) and permitted temperature ranges (−110 °C to 600 °C).
• Performance requirements: set/overpressure tolerances, full‑lift/opening behavior, flow coefficient and effective area calculations.
• Material, manufacturing and dimensional requirements, sealing and seat performance, and marking/identification.
• Inspection, type and acceptance testing procedures, quality assurance and certification suitability (standard declared suitable for certification purposes).
• Amendments and corrigenda: the standard has published corrections and numbered changes (e.g., popravka 2009 and changes issued later) affecting formulae, units and some limit values — consult amendment notices when applying the standard.

Typical use and users

Users include valve manufacturers, pressure‑equipment designers and engineers, petrochemical and oil & gas companies, power plants, boiler and pressure vessel fabricators, inspection/test laboratories and certification authorities. The standard is used to define product requirements, type testing, purchase specifications and routine acceptance tests for safety relief valves.

Related standards

GOST 31294-2005 replaces earlier standards such as GOST 9789-75 and GOST 12532-88 for direct‑acting safety valves and references other GOSTs and safety/measurement standards (examples in various registries). When applying the standard, related normative documents and referenced safety standards (industrial safety, testing and material specifications) should also be consulted.

Keywords

предохранительный клапан; клапан предохранительный прямого действия; давление настройки; давление закрытия; давление полного открытия; седло; ход золотника; коэффициент расхода; эффективная площадь; set pressure; full‑lift; relief valve; safety valve.

FAQ

Q: What is this standard?

A: GOST 31294-2005 is a GOST (interstate) standard that sets general technical conditions and quality requirements for direct‑acting safety (relief) valves used in industrial applications.

Q: What does it cover?

A: It covers valve types, dimensions and sizes (DN 10–DN 300), rated pressures up to PN 400, temperatures from −110 °C to 600 °C, performance parameters (set/closing/full‑lift pressures), testing, marking and quality requirements for valves intended to protect equipment from overpressure.

Q: Who typically uses it?

A: Manufacturers, designers and testers of safety valves and users of pressure equipment (oil & gas, chemical, power generation, boiler manufacturers), plus certification and inspection bodies.

Q: Is it current or superseded?

A: The standard is generally listed as active (действующий) in multiple registries and vendor catalogs; it has been introduced into national application records and has received amendments since initial adoption. Users should check the national/regional standards registry and the most recent amendment notices before relying on specific numeric limits or test procedures.

Q: Is it part of a series?

A: It is an interstate GOST covering general specifications for a class of valves; related GOSTs cover other valve types and complementary test/measurement procedures. The document replaces some earlier national GOSTs for safety valves and is referenced together with additional normative documents in valve design and testing.

Q: What are the key keywords?

A: Keywords include relief valve, set pressure, closing pressure, full‑lift pressure, effective area, flow coefficient, seat, spool/stem travel, two‑position and proportional safety valve. These are the primary terms used throughout the standard.