Product category:
Seals
News Release from: James Walker and Co | Subject: Supagraf control gland packing
Edited by the Engineeringtalk Editorial
Team on 05 January 2006
Gland packing keeps VOC emissions in
bounds
French-manufactured Dresser Masoneilan control valves are now fitted with Supagraf control gland packing to meet the stringent VOC emission control levels specified in ISO15848.
French-manufactured Dresser Masoneilan control valves are now fitted with Supagraf control gland packing to meet the stringent VOC emission control levels specified in ISO15848 This follows close collaboration between Masoneilan and James Walker to meet the tough requirements in tests carried out by Cetim at Nantes, France
This article was originally published on Engineeringtalk on 5 Nov 2004 at 8.00am (UK)
Related stories
Packing cuts control valve emissions below 50ppm
Fugitive emissions from hard-working control valves can now be cut to well below 50ppm claim James Walker about its new Supagraf Control gland packing.
Packing helps valves to meet latest regulations
French-manufactured Dresser Masoneilan control valves are now fitted with James Walker's Supagraf Control gland packing to meet VOC emission control levels when tested to the ISO15848 protocol.
ISO15848 specifies testing procedures for the evaluation of external leakage of valve stem seals and body joints of isolating and control valves used with volatile air pollutants and hazardous fluids.
The Masoneilan control valves are now certified to ISO15848-1 Class BH, CC3, at temperatures from -29 to +425C.
To gain this rating, the valves had to show helium leakage rates less than 0.1ug/s/m for 100,000 stem cycles.
This was achieved with 57.5bar pressure at +425C and 103.4bar from -29 to +38C.
Explained Stephane Leledy of Masoneilan: "Using Supagraf Control, we can supply control valves that meet the new standards and European directives on VOC emissions".
"Our aim is to help industry reduce greenhouse gas emissions in line with the Kyoto protocol".
Supagraf control gland packing was specifically developed by James Walker to cut fugitive emissions from control valves to well below 50ppm.
Made of high purity exfoliated graphite ribbon, reinforced in a novel way, it seals super efficiently with very low friction to enhance smooth and accurate valve movement.
"We view Supagraf Control as the 'best available technology' product to seal the stems of control valves and reduce industry's fugitive emissions in line with the European Union's IPPC Directive", stated Andrew Goulding, James Walker's top specialist on compression packings.
"The PTFE V-type seals traditionally used for control valves cannot operate efficiently at much above +260C, and they usually need a spring-loaded gland follower to overcome stress relaxation", he commented.
"Supagraf Control's recommended temperature range of -200 to +350C with thermal cycling, and maximum system pressure of 210bar, put our valve packing in a far superior league - and this performance is achieved without spring loading".
Supagraf control is supplied as precision moulded rings or sets in sizes to suit all standard control valves.
It also comes in 8m lengths for workshop-based maintenance. Request a free brochure from James Walker and Co ...
• James Walker and Co: contact details and other news
• Email this article to a colleague
• Register for the free Engineeringtalk email newsletter
• Engineeringtalk Home Page
Search the Pro-Talk network of sites
