Pressure resistance, body bending and operating-load strength.
QUALITY / ENGINEERING NOTES
Type testing as per
EN 1074-2
Our water-supply gate valves are type-tested in accordance with EN 1074-2. Test requirements are matched to valve size, operating arrangement and pressure rating.
Bending test assembly
A gate valve installed between supported pipe sections with suspended loading.
Load application
Lever and suspended-load arrangement at the valve test bench.
Torque measurement
Manual torque-wrench operation on a gate valve in the test fixture.
TEST PROGRAMME
Defined checks.
Traceable records.
EN 1074-2 addresses water-supply isolating valves, with EN 1074-1 providing the general requirements and referenced methods.
Leak-tightness and maximum operating torque.
Opening and closing cycles, followed by functional checks.
Valve identification, configuration, instruments, conditions and results.
WORKED EXAMPLES
See how the requirements
translate into numbers.
Illustrative calculations. Values below are example inputs and standard requirements, not measured results from the photographs.
01
EN 1074-2 · 5.2.3, 5.1.4 & ANNEX B
Operating & strength torque
Choose a gate-valve operating arrangement. MOT is the operating-torque limit; mST is the strength-test torque.
Other operating arrangements
Ring key and bar: MOT = DN + 60 N·m; mST = 5 × MOT, with a simultaneous 1,500 N·m bending moment on the operating mechanism. Handwheel: MOT = F × D / 2. Lever: MOT = F × L. The applicable manual force must be established for the operating arrangement.
02
EN 1074-1 · 5.1.1 & 5.2.2
Pressure requirements
Example ratings: PFA = 16 bar; PEA = 25 bar. PFA is allowable operating pressure; PEA is allowable site-test pressure.
Shell strength
p = max(PEA, 1.5 × PFA)
max(25, 1.5 × 16) = 25 bar
High-pressure seat test · water
Δp = 1.1 × PFA
1.1 × 16 = 17.6 bar
The low-pressure water seat test uses 0.5 bar. Use the actual valve ratings and applicable test method; the shell requirement is not automatically 1.5 × PFA.
03
EN 1074-2 · 5.1.3 / EN 1074-1 · ANNEX C
Valve-body bending load
For a DN100 example, the required bending moment is 2,200 N·m. The Annex C arrangement uses two symmetric supplementary forces and accounts for the assembly weight.
Schematic only · dimensions and loads are illustrative
- P
- Total weight of valve, pipes and water, in newtons
- L
- Valve end to nearest support, in metres
- b
- Valve face-to-face length, in metres
- a
- Half the spacing between applied forces, in metres
Example: M = 2,200 N·m; P = 800 N; L = 0.60 m; b = 0.30 m; a = 0.20 m.
F = (4,400 − 288) / 1.10
F ≈ 3,738.2 N per side
Geometry: L ≥ 0.005 × DN metres; a > b/2. Keep loads inside the supports; overhangs are limited to 0.001 × DN metres. Confirm the actual fixture geometry before determining its test load.
FOR YOUR PROJECT
Match the record
to the valve.
Include the model, DN, pressure rating and operating arrangement when requesting the relevant test documentation.
Request test documentationReference basis
EN 1074-2:2000 including A1:2004; EN 1074-1:2000. These notes explain selected calculations; the agreed test programme and applicable standard govern acceptance.
The EN 1074-2 reference applies to isolating valves. Separate product standards apply to check valves, pipe fittings and access covers.