Resilient Seated Non-Rising Stem Gate Valve – Müller

Mô tả

A non-rising stem gate valve is a gate valve design where the valve stem remains stationary and does not rise or fall during operation.
During operation, the stem remains inside the valve body. The operator only sees the handwheel or operating cap rotating in place, while the moving parts are inside the valve.
Technical specifications:
– Sizes: DN50–DN600 (most commonly DN50–DN300)
– Working pressure: PN10 / PN16 / PN25 (depending on manufacturer)
– Material:
+ Valve body: Ductile iron GGG50
+ Valve bonnet: Ductile iron
+ Valve disc: Ductile iron with EPDM rubber coating for resilient seating
+ Valve stem: Stainless steel (SS304 / SS316)
+ Sealing gasket: EPDM / NBR
+ Bolts: Galvanized steel or stainless steel (depending on manufacturer)
– Coating:
+ Epoxy coating inside and outside ≥ 250 µm
+ Corrosion resistant, compliant with potable water standards
– Working temperature: -10 to 80°C
– Application media: Potable water, light wastewater, fire-fighting water, technical/industrial water
Key Characteristics:
– During operation, the stem does not rise, saving space and making it suitable for underground installation, valve chambers, cabinets, and confined piping systems.
– High tightness with zero leakage, compliant with EN 12266-1 and DIN 3230 standards
– High mechanical strength, with better pressure and impact resistance compared to gray cast iron.
– Enhances durability when operating in submerged conditions, preventing stem jamming and corrosion.
– Provides corrosion protection and extends service life.
– For DN200 and above, a gear operator is commonly integrated to facilitate easier operation.
Applicable standards:
– Design and manufacturing: DIN 3352
– Face-to-face dimension: DIN 3202 F4 / F5
– Flange standard: BS EN 1092-2:1997
– Epoxy coating: DIN 30677 / ISO 12944