EN 1074-2:2000/A1:2004

Overview

EN 1074-2:2000/A1:2004 is a CEN amendment addressing valves for water supply - Part 2: Isolating valves. The amendment corrects the test procedure in Annex C (C.2: "Test method for the operation of valves") and clarifies the verification sequence for isolating (shut-off) valves. It focuses on ensuring fitness for purpose through practical verification tests that confirm seat tightness and operational torque under hydrostatic conditions.

Key Topics and Requirements

• Scope: Applies to verification tests for isolating valves used in water supply systems; the amendment revises the C.2 test method.
• Test procedure (corrected C.2) - key steps include:
  • Fit a blanking plate with a vent valve to the outlet flange and connect the inlet to a hydrostatic pressure source.
  • Partially open the obturator and the vent valve; fully fill the valve body and vent all air.
  • Close the obturator and apply a torque equal to MOT (the specified test torque).
  • Raise pressure to PFA (the specified test pressure) and maintain it for at least one minute.
  • Check seat tightness while holding pressure.
  • Open and close the valve while ensuring the running torque during operation does not exceed MOT; record the maximum torque observed.
  • Repeat the entire test from the opposite side (bi‑directional verification).
• Operational checks: Confirms both leak-tightness at the seat and that operating torque remains within acceptable limits during pressurized cycling.
• Practical notes included: The test procedure highlights that a large volume of water is evacuated through the vent valve during opening.

Applications and Users

This standard and its corrected test method are essential for:

• Valve manufacturers - type testing, quality control, and design verification for isolating valves.
• Independent test laboratories - performing hydrostatic and operational torque tests to certify compliance.
• Water utilities and network operators - specifying procurement and acceptance criteria to ensure reliable isolation under pressure.
• Specifiers and regulators - incorporating fitness-for-purpose requirements into technical specifications and approvals.
• Installers and maintenance teams - understanding test expectations for commissioning and troubleshooting.

Related Standards

• EN 1074 series (other parts covering valves for water supply) and documents produced by CEN/TC 69 (Industrial valves).
• National adoptions (e.g., SIST EN 1074-2:2001/A1:2004) reflect mandatory implementation timelines across CEN member bodies.

Keywords: EN 1074-2:2000/A1:2004, valves for water supply, isolating valves, fitness for purpose, verification tests, test procedure, hydrostatic pressure, seat tightness, MOT, PFA.