Metal seat gate valve NRS

Metal seated non rising stem gate valve

Design standard:DIN3352 F4,F5,BS5163

Flange:EN1092 PN10,PN16,BS4504 PN10,PN16

Working pressure:PN10,PN16

Working temperature:0-80℃

Body material:ductile iron GGG50

Stem:2Cr13,SS304,SS316

Wedge:ductile iron GGG50

Wedge nut:brass

wedge seat ring:brass

Body seat:brass

Gasket:NBR

Bolts:Galvanized steel,or SS304,SS316

Handwheel:ductile iron GGG50

Size:DN50 to DN1200

Operation:DN50-DN600,manual handwheel operation

DN700-DN1200,with gearbox and handwheel operation

Packing:Plywood case

ductile iron metal seated non rising stem flanged gate valve for water.

Drawing

Ductile iron solid wedge metal seated non rising stem flanged gate valve with handwheel,sizes from DN50 to DN600,and working pressure PN10 and PN16,flange drilling to EN1092 PN10,PN16,DIN2501,standard DIN3352 F4,DIN3352 F5 and BS5163,used for water.
Zhixin Valve Co.,Ltd is a professional manufacturer of ductile iron valves in Fujian province,China,manufacture ductile iron metal seated gate valve for water.welcome to contact us for price and other valuable information.

What are the advantages of metal-seated gate valves?

Abrasion Resistance: Metal seats are less prone to wear and erosion, especially when handling abrasive media.
Tight Shutoff: Metal-to-metal contact provides a reliable seal, minimizing leakage even under high pressure conditions.
Durability: Metal seats have a longer service life compared to soft-seated valves.
Fire Safety: Metal-seated valves are fire-safe due to their ability to maintain a tight seal during fire exposure.

How to maintain metal-seated gate valves?

Maintaining metal-seated gate valves is essential to ensure their longevity and optimal performance.

Here are some guidelines for proper maintenance:

1.Regular Inspection:Periodically inspect the valve for signs of wear, corrosion, or damage.

Check the flange faces, joint sealing surfaces, body seats, and disc seats. Ensure they are clean and free from debris.

2 Stem O-Ring Replacement:Depending on usage, consider replacing the stem O-ring periodically to reduce the risk of leakage

3.System Pressure Relief:Before performing any maintenance, relieve the system pressure to prevent accidents or damage

4.Operational Testing:Open and close the valve to verify proper operation.Ensure stops or limit switches are correctly set so that the valve seats fully

How do I prevent corrosion in metal-seated valves?

Preventing corrosion in metal-seated valves is crucial for their longevity and reliable performance. Here are several effective measures you can take:

Material Selection:
- Choose the right valve material based on the specific application and the types of chemicals or conditions involved.
- Consider materials like stainless steel, Hastelloy, and Monel, which offer inherent corrosion resistance.
Protective Coatings:
- Apply protective coatings to create a barrier between the valve’s surface and corrosive elements.
- Coatings such as epoxy, PTFE, and ceramic coatings are commonly used.
Use Non-Metallic Materials:
- Opt for non-metallic materials for valve components (e.g., valve body, valve cover, lining, sealing surfaces).
- Materials like nylon, polytetrafluoroethylene (PTFE), and rubber provide good corrosion resistance.
Electrochemical Protection:
- Anodic protection involves adding an external direct current to form a passivation film on the metal anode surface.
- Cathodic protection lowers the potential by applying a direct current, reducing metal cathode corrosion.
- Sacrificial metals (e.g., zinc) can also protect the valve through cathodic protection
- 5.Control Corrosive Environment:
- Monitor and manage the environment where the valve operates to minimize corrosive factors.
- Consider temperature extremes, chemical exposure, and moisture levels.