ISO 1452-4:2009

Overview

ISO 1452-4:2009 defines requirements for PVC‑U (unplasticized polyvinyl chloride) valves used in plastics piping systems for water supply and for buried and above‑ground drainage and sewerage under pressure. It specifies material, geometric, mechanical, physical and chemical characteristics, and the test parameters for methods referenced. The part applies together with ISO 1452‑1, ‑2, ‑3 and ‑5 to valves intended for water mains, above‑ground conveyance, and pressure drainage/sewerage - for cold water up to 25 °C and for water/wastewater up to 45 °C.

Key topics and technical requirements

• Scope and applicability: Covers PVC‑U valves with components of PVC‑U, other plastics and non‑plastics for solvent‑cemented, elastomeric ring seal and flanged joints.
• Materials:
  • Valve body material must conform to ISO 1452‑1.
  • Density requirement for valve bodies: 1 350–1 460 kg/m3 (measured per ISO 1183‑1).
  • Minimum Required Strength (MRS) must be declared and confirmed by testing.
• Geometrical characteristics:
  • Dimensions and nominal diameters follow ISO 3126 and ISO 1452‑2/‑3 conventions.
  • Socket, spigot and flange mating dimensions are specified to match pipes and fittings.
• Mechanical and performance tests:
  • Resistance to internal pressure, crushing (maximum deformation), durability and functional tests are specified with reference test methods (e.g., ISO 1167 series, EN 802).
• Physical and optical properties:
  • Injection‑moulded valve bodies: grey throughout and opaque (≤ 0.2% visible light transmission per ISO 7686).
• Sealing, adhesives and marking:
  • Requirements for sealing rings and adhesives to ensure system fitness (see ISO 1452‑5).
  • Minimum and additional marking requirements are specified for traceability and correct selection.

Applications and who uses this standard

ISO 1452‑4:2009 is used by:

• Manufacturers of PVC‑U valves and components to design, test and certify products.
• Specifiers and procurement teams in water utilities, municipal sewerage, and building services to select compliant valves.
• Engineers and designers involved in water distribution, buried mains and pressure drainage systems.
• Test laboratories and conformity assessors executing the referenced test methods and documenting MRS/density/marking. Note: the standard does not by itself determine national regulatory acceptance for potable water - users must consider local regulations.

Related standards

• ISO 1452 series: Part 1 (General), Part 2 (Pipes), Part 3 (Fittings), Part 5 (Fitness for purpose)
• Normative references include ISO 1167, ISO 1183‑1, ISO 3126, ISO 7686, valve‑type standards ISO 16135–16139, ISO 21787, and EN 802.

Keywords: ISO 1452-4:2009, PVC‑U valves, plastics piping systems, water supply valves, buried drainage, valve testing, MRS value, solvent cement, elastomeric ring seal, flanged valves.