PN25 Soft Seat Ductile Iron Wafer Butterfly Valve EN593

The main difference between pn25 soft seat wafer butterfly valve and hard back seat wafer butterfly valve is the seat material:

• 1. Compared with the hard-backed valve seat, the soft-backed valve seat has a wider contact surface with the pipe flange, and the installation and sealing performance is better, without the need for a special flange for butterfly valves;
• 2. The soft-backed valve seat is highly replaceable and does not require any special tools. The replacement can be completed;
• 3. The wall thickness of the hard-backed valve body is relatively thin, and the valve body is easily deformed. The wall thickness of the soft-backed valve body is larger than that of the hard-backed valve body, and the valve body is heavier. The different shape designs prevent the valve body from deforming. Deformation.
• 4. The vulcanization process of the soft-backed valve seat is more perfect, and there will be no phenomenon of immature rubber of the hard-backed valve seat. The rubber performance is more reliable.
• 5. The soft-backed butterfly valve has small torque.
• 6. Soft seat butterfly valve can reach PN25.
• 7. Ductile iron disc with nickle coated is the most economical type.
• 8. Lever is suitable for DN≤200.

Material

Part Name	Material/Method
Body	Ductile Iron, Casting Iron, WCB, LCB/LCC, Stainless Steel, Duplex Stainless Steel, Aluminium Bronze
Disc	Ductile Iron(Coated/Lined), WCB, LCB/LCC, Stainless Steel, Duplex Stainless Steel, Aluminium Bronze
Seat	PFA, Rubber(EPDM/NBR/VITON), Nature Rubber, Silicon Rubber, PU, HNBR, Hypalon
Stem	304, 316, 420(2Cr13), 431, 1.4462, 17-4PH, Monel
Actuator	Handlever, Worm Gear, Electric, Pneumatic

Technical Parameters

ITEM	Standard
Design	EN593 | API609
Face to Face	EN558 | ISO5752 | API608 | BS5155-4
Top Flange	ISO5211
Flange Drilling	PN6 | PN10 | PN16 | ASME B16.5 CL150 | JIS 10K
Pressure Rating	PN6 | PN10 | PN16 | PN25 | CL150 | JIS 10K
Tightness Test	ISO5208 | API598 | EN12266-1