Safety Valves

General information

In normal operating conditions, safety valves have to close tightly and must open, if pressure increases to an inadmissibly high figure; they have to avoid further pressure increase and must shut again, after the pressure has been reduced.

Hofer safety valves meet these requirements in all respects.

In order to ensure a faultless function, the regulations and rules as per DIN 3320 and AD-Merkblätter have to be followed.

Foto: Safety valve without lifting device
connection: female thread

Special Uses

Hofer safety valves can be used for almost all technical gases. For oxygen service however a selection of special materials and a special design is necessary. These have been certified by Bundesanstalt für Materialprüfung (BAM) Berlin.
Particular synthetic sealing elements are required for CO2 operation. Thus we always require to state operating conditions and type of gas for all inquiries and orders.

Features

TÜV . SV . 99-724 . 6 . D/G . . p

pressure equipment directive 97/23/EC

Particularly to be observed

• sufficiently large difference of working pressure (recommended working pressure difference up to 20 bar appr. 15%, up to 1000 bar approx. 10%, more than 1000 bar approx. 5%)
• clean media
• vertical and vibration-free installation of safety valves

The reaction forces, arising during blow-off, have to be considered during installation.

HOFER Sicherheitsventile DN 6:
5,5 to 1100 bar, -60 to +200°C

- classification acc. to AD Merkblatt A2
- type-test approved for vapours and gases
- also suitable for liquids
- exchangeable seat and cone
- various types of seat sealing

Design:
- spring loaded, closed safety valves,
- type-test approved by VdTÜV.
- with and without lifting device.

Approval:
Setting of the valves is done in the workshop, if requested, witnessed by an authorized inspector of TÜV or of another acceptance authority, such as Lloyd's, DNV, etc.