L40800 adopts the design of maze type valve cage joint pressure balanced type valve spool and consists of a plurality of circular disk (layer) with coaxial surfaces distributed with labyrinths. According to the different process parameters of the medium, we design a number of valve cages, containing labyrinths with different specifications and circular disks with different layers. The cage divides the whole flow path system into a number of small and roundabout or even stepped flow path, forcing the fluid to constantly change the flow direction and flow area so as to gradually reduce the fluid pressure to achieve the purposes of flash evaporation and cavitation prevention and to extend the life of internal parts of valves. This kind of internal construction is suitable for all kinds of valve parts which are easily corroded by the blocked fluid.
Balanced internal parts of balanced labyrinth multi-stage pressure relief control valves can be selected as follows:
1. Cagetype single-seat balanced internal parts: High leakage, small operating temperature range)
2. Cagetype two-seat balanced internal parts: Low leakage, huge operating temperature range)
Parameter specification of control valves
The features of internal valve parts: Socket-oriented maze-gasket valve cage
Balanced
valve parts (unbalanced internal parts also acceptable)
Ordinary two-seat type or single-seat type with balanced seal ring
Body types: Straight-shaped, angle-shaped, z-shaped.
Bonnet types: Standard ordinary temperature type, high-temperature heat dissipation type, low-temperature elongation type.
Temperature range: -196℃ to 538℃.
Valve stem seal type: Ordinary standard packing seal, high-temperature packing seal, bellows seal.
Leakage classifications of control valves
CLASS IV (metal seat without balanced seal rings
CLASS V (metal seat with balanced seal rings)
Flow characteristics: Equal percentage, line
Pipe connections: Flanged Ends
Adjustable ratio: 30:1
