The R850 series double seat control valves are generously proportioned to give long life under the most arduous service. Valve internals are top and bottom guided to give the plug maximum support and stiffness and three different plug forms are available. Reduced trims can be fitted offering smaller port sizes than normal.
3/4″, 1″, 1½”, 2″, 3″, 4″, 6″ 8″
Carbon Steel, St/Steel
Flanged, screwed or weld preparation to customers requirements.
MAXIMUM BODY RATING
Carbon steel and St/Steel 600 lbs.
PLUG AND SEATS
316 grade st/steel with stellite facing available as an extra. Seats are screwed in and replaceable. Equal percentage, linear or quick open plug forms are standard and soft seated plugs using Viton or Fluon 0-rings are available in sizes 1½” and upwards.
Spring loaded Fluon V-rings. For higher temperatures graphited asbestos-free packing can be supplied.
Standard bonnet and packing can be used from minus 15 to plus 235ºC. The standard bonnet can be used with graphited asbestos free packing to 315ºC. For temperatures above 235ºC an extension bonnet is available to keep the packing box at reasonable temperatures and clear of pipe lagging and insulation. Bellows gland seal system available. The R850 body is available direct acting (push down to close) or reverse acting (push-down to open). The R850 can be supplied complete with positioner, limit switches, solenoid valves, fail-fix locking valve and also supplied as a unit with the ESME R88 Pilot.