Ytc YT-1000 series, Руководство по эксплуатации продукта

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Smart Positioner
YT-1000 / 1050 series Product Manual
Ver. 1.04 31
3.2 Rotary Positioner
Fig. 3-2: Rotary positioner with an actuator
When INPUT SIGNAL is supplied to the positioner to open the valve, power is generated
from
①
the torque motor and pushes
②
the flapper to the opposite side of
③
the nozzle.
The gap between
③
the nozzle and
②
the flapper becomes wider and from inner part of
④
the pilot, left to
⑤
the spool, air inside
⑨
the chamber is exhausted through
③
the nozzle.
Due to this effect
⑤
the spool moves to the right. Then,
⑦
the seat which was blocked by
the poppet pushes
⑧
the poppet away and supplied pressure (air) goes through
⑦
the seat
and OUT1 Port and enters into
⑩
the chamber of the actuator through OUT1. Then
⑩
chamber’s OUT 1 pressure will increase and the actuator’s
⑪
stem will rotate and
through
⑫
the
feedback shaft, actuator’s rotating motion will be transferred to
⑬
the cam.
This motion will then rotate
⑭ the span lever and pull the span’s ⑮
spring. Once it reaches
to given input signal, span
⑮ spring’s pulling force and ① torque motor’s power will be
balanced and move
②
the flapper back its original position to reduce the gap between
③
the nozzle. The amount of air being exhausted through
③
the nozzle will reduce and left to
⑤
the spool
⑨
chamber pressure will increase again.
⑤
Spool will move back to its original
position on the left and
⑧
the poppet will also move in same direction blocking
⑦
the seat
to stop the air coming into the
⑩
chamber through the SUPPLY. As a result, the actuator will
stop operating and the positioner will return to its normal condition.