Standard - WEKA AG

WEKA AG, CH-8344 Bäretswil & CH-2300 La Chaux-de-Fonds, Switzerland
Phone +41 43 833 4343 - Fax +41 43 833 4329- Schürlistrasse 8, CH-8344 Bäretswil
Phone +41 32 925 97 00 - Fax +41 32 926 54 22 - Allée du Quartz 1, CH-2300 La Chaux-de-Fonds
WEKA Specification no. 19911004 – WEKA Cryogenic Valves
info@weka-ag.ch - www.weka-ag.ch
19. September 2007 - FHo / Page 2 of 7
The valve actuator spindle is flexible clutched on the bellows inset. This design guarantees an optimised
adaptability to any functions requested and protect the valve against any inaccuracies from the actuator. A manual
drive or pneumatic, electrical or hydraulic actuator could be fitted.
Beside the possibility to turn the actuators in any circumferential position - in case of restricted space on cold box
plates - it also allows a later modification of actuators on mounted valves to fulfil new functions.
3. Valve Actuators
WEKA Cryogenic Valves are supplied with manual, pneumatic or electrical actuators for on/off (digital) or control
functions. Actuator control accessories like limit switches, positioner, 3/2-way solenoid valves etc. are selected
according to the specified valve function.
Pneumatic and electrical actuators as well as their accessories are bought from selected proven manufacturers.
However, all current products, as per the customer’s request, could be assembled on request. Also available are
pneumatic- or hydraulic piston drives.
Actuator size and system is derived by the valve size (DN), the specified service or shut off pressure pressure,
the available supply of energy (air pressure, power) and the plant control system. Also to act are specifications
about actuating time, fail function in case of loss of energy supply and other restrictions like x-ray radiation's or
explosion proof areas.
4. Manufacturing and Quality Assurance
Based on our long-standing experience in design, manufacturing and testing of Cryogenic Components we are
in a position to offer you a made-to-measure solution for almost any requirement.
Apart from the latest state of the art production equipment such as CAD-systems, fully integrated PPS with online
BDE-system, CNC machine tools, TIG- (GTAW) welding equipment as well as He-leak tightness detector,
ultra-sonic cleaning bath and separated assembling and testing rooms, we also maintain a appropriate QAsystem.
The welding shop is qualified according to EN-, SVTI-, AD- and ANSI/ASME codes.
WEKA Cryogenic Valves are individually He- leak tested over the valve seat and to outside, both under vacuum
and pressure conditions. Valve bodies additionally are hydrostatic- or gas pressure tested. All these tests are
executed, if possible, on the completely fitted valve and according to written procedures specifications.
A end check of all valve function, dimensions, completeness of all accessories as well as adjusting of actuators
and cleanliness of fluid contacted surfaces is carried out prior to despatch.
For despatching the valves are packed in PE bags.
All tests indicated above are specified in detail in the "Standard Delivery Specification for Cryogenic- and Bellows
Sealed Valves"
Additional tests and inspections according to customer’s request will be possible.
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