BS EN 1074-2 DN450 PN10 Ductile Iron Flanged Gate Valve HS Code:8481804090
Ductile Iron Handwheels
DUCTILE IRON MATERIAL
GGG50
GGG40
EN-GJS-500-7
EN-GJS-400-15
QT400-18
QT450
QT500
Advantages of Ductile Iron Handwheels
vs. Carbon Steel:
1.Higher Strength & Toughness -
Resists impact and deformation better.
2.Superior Corrosion Resistance -
Longer lifespan in harsh environments.
3.Enhanced Vibration Damping -
Smoother operation, reduces fatigue.
Necessity of Bolt Selection for Cast Iron Handwheels
1.Prevents Mechanical Failure - High-grade bolts resist shear stress and cyclic loads during operation.
2.Avoids Corrosion-Induced Loosening-Stainless/coated bolts maintain grip integrity in humid/corrosive environments.
3.Ensures Proper Load Distribution-Correct bolt size minimizes localized stress on cast iron threads.
Common Bolt Types & Selection Guidelines:
(SS201, SS304, High-Strength Carbon Steel)
1.SS201 Stainless Steel Bolts.
2.SS304 Stainless Steel Bolts.
Key Attributes: Excellent corrosion resistance.
3.High-Strength Bolts.Material: Heat-treated carbon/alloy steel.
Selection Tips:
Prioritize corrosion resistance (SS304 > SS201) for wet/chemical exposure. Choose high-strength bolts for critical load-bearing joints.
Match bolt grade to substrate hardness
Lifting Lugs/Holes
1.DN250 and above
2.With high-strength carbon steel lifting ring,
3.In line with relevant lifting standards.
Advantages of Soft Seal Gate Valves with Lifting Lugs/Holes
Ease of Installation
Simplifies safe handling and positioning using lifting equipment.
Reduced Risk of Damage-
Avoids direct contact with valve body,
preserving structural integrity.
Importance of High-Strength Bolted Connection
in Soft-Seal Gate Valves (Body & Bonnet)
1.Ensures Leak-Free Sealing-Maintains tight joint integrity under pressure and thermal cycling.
2.Resists Mechanical Stress-Withstands high loads/vibration without deformation or failure.
3.Simplifies Maintenance-Allows safe disassembly/reassembly for inspection or part replacement
Advantages & Applications of Soft Seal Gate Valves
in Water Supply/Drainage Systems
1.Zero Leakage-Elastic seals (e.g.,EPDM,NBR) ensure tight shutoff,critical for potable water and wastewater systems.
2.Corrosion Resistance-Withstands aggressive media (chlorinated water, sewage) without seal degradation.
3.Ease of Operation-Low torque design enables manual/small actuator use,ideal for frequent on-off cycles.
4.Low Maintenance-Replaceable seals reduce downtime and costs in large-scale municipal networks.
5.Versatility in Media-Handles sludge,suspended solids,and non-abrasive fluids common in drainage systems.
| Bolts |
SS201/SS304/Carbon Steel |
| Gasket |
EPDM/NBR |
| HandWheel |
GGG50/GGG40/EN-GJS-500-7
EN-GJS-400-15/QT400/QT450/QT500 |
| O-Ring |
Silica gel/EPDM/NBR |
| Holding Ring |
Brass |
| Handwheel Square |
34*34mm |
| Open and shut circles |
38 Circles |
| Torque |
Real:200N*M :Quoted:300N*M |
| Body |
GGG50/GGG40/EN-GJS-500-7
EN-GJS-400-15/QT400/QT450/QT500 |
| Gasket |
EPDM/NBR |
| DISC |
DI+EPDM+NBR |
| Gasket |
|
){kind=link}