Outline

The 10M Series balanced labyrinth control valve adopts the labyrinth cage and balanced plug design. The labyrinth sleeve is composed of cylindrical discs with many coaxially distributed labyrinths. According to different technological parameters of the media, different labyrinth specifications and piling layers are designed to form the cage and the cage designed to form the cage and the cage divides the whole flow channel into several tiny circuitous or step flow channels, forcing the fluids to continuously change the flow direction and flowing area and gradually reducing the pressure of fluids, so as to prevent the occurrence of flash evaporation and cavitation and prolong the service life of the trim. The balanced sleeve plug is adopted. The closely fit plug and seat ensure very low leakage. The trim is suitable for service conditions under which blocked flow will easily be produced and cavitation will be caused.

Parameters of control valves

DN	20~450mm
PN	Class150~2500
Applicable temperature range	-30°C~260°C (single-seat structure)
	-196°C~570°C(double-seat structure)
Trim features	sleeve guided type, balanced trim structure
Body type	straight-through type, angle type
Bonnet type	standard type, heat dissipation type, cryogenic type
Flow characteristic	equal percentage, Linear, quick open
Shut-off class	ASME B16.104 V (standard metal seat)
	AS ME B16.104 V I (shut-off soft seat)
Pipe connection type	flange type, Butt welding type
Actuator type	pneumatic diaphragm actuator
	pneumatic piston actuator
	Electric actuator

Speed control principle of labyrinth control valve

The valve that is damaged by cavitation, flash evaporation, vibration and noise produced by the media that passes through the valve at a high flow velocity is the main cause that leads to failure of control in the system. Even if the valve is not damaged, bad process control caused by too high noise and severe vibration will lower product performance and influence the running capacity of the equipment. Based on the principle of fluid mechanics, the labyrinth control valve adopts speed control principle and technology and makes use of multi-stage pressure drop to eliminate cavitation, flash evaporation, vibration, noise, etc ., providing overall system control solutions form any different application fields.Under severe service conditions, bad performance of valves is caused by too high flow velocity. The maximum flow velocity of the fluids in the valve always

occurs at the throttling face(figure1) which is at the downstream side of the restriction orifice of the plug .Even if materials of relatively high hardness are used in the valve to control the damage caused by cavitation , only a small amount of faults in the valve caused by too high flow velocity of the media can be eliminated. The flow velocity of media in all valves must be controlled so as to maintain the performance and reliability of the valves.