21000 Series single ported unbalanced trim, heavy top guided control valves are designed with built in versatility making them well-suited to handle a wide variety of process applications. Standard features include:
Rugged, heavy top plug guiding provides maximum support to ensure plug stability.
Single and Double Stage Lo-dB ® /Anti-cavitation Trim
Replacing the conventional plug with the Lo-dB ® /Anti-cavitation design provides excellent noise attenuation or cavitation control.
Reduced Capacity and Low Flow Trim
A series of reduced area trim is available to provide wide flow range capabilities in all valve sizes. Optional trim to meet low flow requirements is also available.
High Pressure Capability
A variety of actuators are available to handle low to high pressure drop requirements. Allowable pressure drops for specific leakage classes are available in Masoneilan document PH1080, or can be calculated using the Masoneilan Valspeq ® Sizing and Selection Program.
Class IV leakage is standard. Optional constructions meet IEC 534-60534-4 and ANSI/FCI 70.2 Class V and VI.
Provided as standard to handle high pressure drop applications.
Standard construction offers either a quick change or threaded seat ring. This trim is unbalanced and uses no seals or pilots.
Low emission LE ® Packing is available to assure compliance with latest environmental regulations.
Bellows seal design option is available to meet zero emissions requirements.
The 21000 Series is available for Sour Service Applications using design and construction methods in accordance with NACE Standard MR 0103. Applications requiring compliance to MR 0175, 2003 Rev or IS0 15156 require engineering review.