[giblit]

Thank you both for your help and your prompt response.
That’s certainly an avenue worth exploring further, however, as there are very few UK based valve manufacturers it’s sometimes difficult to get information quickly. Furthermore, in the past some vendors have been reluctant to spend time supplying information if the project is outside of their normal supply (i.e they might not normally supply to the middle east or are not on the approved vendors list for the company you work for)
Is there anywhere else i could go for info ? (standards, on-line catalogues etc.)

thanks again