• Design Generally to BS EN ISO 5167
  
• Range of Orifice Types
  - Concentric Square Edge
  - Restriction
  
• Range of Designs
  - One Piece Construction
  - Screwed On Plate
  
• Proven technology
  
• Suitable for 1” lines and above
  
• Orifice sizing on request
  

General Description
The RTJ type orifice plate incorporates an integral gasket, either oval or octagonal ring, for mounting between ring type joint flanges. It is based on proven technology, has no moving parts and is suitable for high temperature and pressure applications. Orifice plates are recommended for clean liquids, gases and low velocity steam flows.

Dimensions
Plate thicknesses depend on line size and differential pressure, and should be sufficient to prevent the plate from bending under operating conditions.

Orifice plates can be made in accordance with customer drawings as required.

Materials
RTJ type orifice plates may be machined in one piece, or alternatively from two pieces, with an orifice plate screwed onto a carrier ring/gasket. Standard material grades for orifice plates include 316 Stainless Steel, 304 Stainless Steel, 310 Stainless Steel, Hastelloy® C276, Hastelloy® B3, Duplex Stainless Steel, Super Duplex Stainless Steel, Monel® 400, Carbon Steel, Titanium, Incoloy® 800, Incoloy® 825, Inconel® 600 and Inconel® 625.

Common carrier ring/gasket materials include Stainless Steel and soft iron. To ensure correct sealing when installed between flanges, the hardness of the carrier ring/ gasket material is limited to a maximum value, typically 120HB for soft iron rings and 160HB for Stainless Steel Rings.

Please contact the sales office for other grades.

British Rototherm Company Limited,
Kenfig Industrial Estate, Margam,
Port Talbot   SA13 2PW
United Kingdom

Telephone: +44 (0) 1656 740 551
Facsimile: +44 (0) 1656 745 915
E-mail: rototherm@rototherm.co.uk

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British Rototherm Company Limited is Registered in Wales: 2570730