old SO CV 33A21
-6
new SO CV 33B21
-6
NEW SPRING CHECK VALVE PVDF / PA DESIGN PREVIOUS SPRING CHECK VALVE
STARTING POINT
Due to technical product optimization, the check valve cone made of PVDF and PA is revised to fulfill the requirements for tightness and switching behavior in critical applications.
O-RING GASKET REPLACED
O-rings are proven sealing components that are also used in SERTO stainless steel check valves. This solution guarantees a consistently high sealing quality; equally with those used FKM (Standard material), EPDM and FFKM The Stainless steel spring (1.4310) replaced the plastic spring. The stainless steel springs guarantees superior mechanical properties and a
IMPROVED CONE CHECK VALVE
permanently high bias voltage respectively sealing force in spring check valves. The injection-molded plastic spring, however, could get loose over time under certain operating parameters. In specific applications, metal is undesirable in spring check valves. The use of stainless steel springs with plastic coating shall be investigated.
VALVE PLUG IN ONE PIECE
The valve plug in two parts is replaced by one piece. The valve cone has an O-ring groove to support and guide the stainless steel spring. Optimized Cone check valve PVDF / PA
STAINLESS STEEL SPRING
Opening pressure Standard: 0.2 bar Âą 0.1bar Options: On request
O-RING
Seal Standard: FKM Options: EPDM, FFKM
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NEW SPRING CHECK VALVE PVDF / PA DESIGN
old SO CV 33A21
-6
new SO CV 33B21
-6
FUNCTION / APPLICATIONS / ASSORTMENT
•B etween
the Spring check valve versions there are no changes in function, Applications, pressure drop, flow indicators, options and mounting dimensions. •T he range offered and the gross selling prices remain unchanged. •T he check valves have new reference numbers and part numbers. Example: old SO CV 33A21-6 (138.7300.060) new SO CV 33B21-6 (138.3010.060)
PVDF
PA
DETACHMENT
From now fluent, starting with FKM in sizes 4, 6 and 8 mm.
FKM
4 PVDF new
PA
6
PVDF new
sizes 8 PA PVDF new
PA
10
PVDF old
PA
12
PVDF old
EPDM
old
old
old
old
old
FFKM
old
old
old
old
old
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