DeZurik APCO 100SA Panduan Pemasangan, Pengoperasian, dan Pemeliharaan - Halaman 7
Jelajahi secara online atau unduh pdf Panduan Pemasangan, Pengoperasian, dan Pemeliharaan untuk Unit Kontrol DeZurik APCO 100SA. DeZurik APCO 100SA 14 halaman. Rubber flapper swing check valves
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Operation
(Continued)
5. Start pump. While valve is opening, visually ascertain that buffer rod fully extends into the valve
body. If not, pressurize hydro-pneumatic tank until it does. The chart below shows the
maximum stroke length of the buffer rod for the following sizes:
Valve size
Buffer Rod Stroke
6. Shut-off pump and observe rate of closing. Based on this initial run, make necessary
adjustments to the flow control valve and/or the internal cushion needle valve until satisfactory
closing is achieved.
A split collar is mounted on the buffer rod to lock it in place when it is necessary to disconnect the
cylinder for repairs while the pump is running. In very rare cases however, it can be used to shorten
the buffer rod stroke when the system demands higher percentage of free fall closing of the flapper.
The Rubber Flapper Check Valve with bottom mounted buffer has two controlling stages in the closing
cycle. The flow control valve controls the first stage of flapper closure and the secondary control is the
internal cushion needle valve which controls the remaining 20% of the buffer stroke.
December 2012
APCO CRF Rubber Flapper Swing Check Valves
4" 6" 8" 10" 12" 14" 16" 18" 20" 24" 30" 36" 42" 48"
1-1/2
1-5/8
Figure 2 – Bottom Mounted Buffer Assembly
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