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Self Closing and Centering Valve-System (SCCV-System) |
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MIYAWAKI's internationally patented SCCV-System has proven its high reliability and effectiveness during almost three decades.
Many thousands of steam traps equipped with this technology have proven enormous advantages for our customers:
- a substantially longer life compared with other steam traps
- no partial or one-sided precipitate wear of valve and seat
- greatly reduced wear of all internal parts due to the reduction of the closing forces required to maintain a seal
- no steam loss for all temperature control steam traps.
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Basic Principle of the SCCV - System
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"Free Floating"
of the valve inside the valve holder – thereby precise closing of the valve in the center of the seat
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A spring and a spring plate inside the control chamber
absorb and soften the movement of the valve into the seat
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The upstream valve/seat design and the valve lift are
designed in such a way that the valve will be closed by the flow of the condensate
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Centering |
Regulating |
Soft Closing |
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Flexible adjustment to various types
Intensive research and development activities over many years have enabled
MIYAWAKI to incorporate the SCCV-System in various types of steam traps. Thus it became
possible to adopt the SCCV-System not only to Bimetal steam traps, but also to Inverted
bucket and Float type steam traps.
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Inverted Bucket Steam Traps
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Inverted Bucket Steam Traps
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Series ES
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Series ER
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The valve holder is fixed to a specially developed "Super-Lever".
The valve is "free floating" inside the valve holder.
Thus the control space inside the valve holder decreases the force
toward the seat caused by the movement of the bucket. The valve will
close softly and exactly in the center of the seat.
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The SCCV-System is part of a "Double Valve Unit" which is operating on the basis
of the pressure difference inside the unit. The trap is thus characterized by
extended life of the valve assembly and a greater condensate discharge per body size
when compared to conventional inverted bucket steam traps.
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Ball Float Steam Trap
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Bimetallic Temperature Control Steam Traps
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Series G11N / G12N
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Series TB7
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The valve (ball) lies inside a valve holder, which is
directly connected through a lever with the float. By installing a spring inside
the valve holder the movement of the float and the forces caused by it will not be
directly transferred to the valve. This will increase the service life of the
sealing surfaces.
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The bimetal unit including the valve are guided
inside the body. A spring reduces the force caused by the deflection of the bimetals
which move the valve toward the seat. The guiding of the valve within the seat and
the lift of the valve are designed in such a way that the valve will close very
smoothly in the center of the seat.
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The use of the SCCV-System for Temperature Control Steam Traps
Models TB7
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On start-up, the bimetal discs are all
flat and the valve shaft is up with the
valve fully open. Virtually all cold
condensate and air are discharged.
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As the temperature of the condensate
increases, the bimetal discs
begin to curve gradually and force
the valve shaft and the valve holder
to move down.
Most of the condensate is
still discharged quickly,
since the valve and the holes
in the fixed guide on the
valve seat are still fully
open.
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When condensate with higher temperature
(near to set temperature)
flows in, the bimetal discs are curved
even more and , at the same time,
the valve shaft moves down and the
valve holder closes the holes in the
guide partially.
The amount of condensate
being discharged is reduced
quickly. This prolongs the
time that the hot condensate
stays near the bimetal discs
and the heat of the condensate
is transferred to the bimetals
much more effectively.
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In case of very low condensate flow,
the holes in the guide are closed
completely by the valve holder and
the valve will close precisely in the
center of the seat. Normally, the trap
is filled with hot condensate and the
operation will rest in the state shown
in figure 3. Condensate will be discharged
continuously.
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Copyright © 1999 - 2009 MIYAWAKI GmbH
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