Self-Closing and Centering Valve – System
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 sustainability 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.
Basic principle of the SCCV - System
"Free floating" of the valve inside the valve holder – thereby precise closing of the valve in the center of the seat.
A spring and a spring plate inside the control chamber absorb and soften the movement of the valve into the seat (caused by temperature and pressure change)
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
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 to wide pressure ranges and not only to Bimetal steam traps, but also to inverted bucket Float type steam traps.
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.
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.
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.
The bimetal unit including the valve is 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.
The use of the SCCV-System for Models TB 51, 52, 71, 72, 81 and 82
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.
КAs 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.
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.