- 1/2 in to 16 in
- Stainless Steel 304/316/316L, WCB, Cast Iron
- 16/25/40 bar
- -10 to 425℃
- Water, Oil, Gas, etc.
- ANSI, JIS, DIN, GB standard
Specification
SS304 Stainless Steel Two Ways ANSI Solid Wedge Cast Iron Manual Control Gate Valve
|
Size Range |
1/2 in to 16 in |
Connection |
Flange Connection |
|
Material |
Stainless Steel 304/316/316L, WCB, Cast Iron |
Pressure |
16/25/40 bar |
|
Liquid Tmperature |
-10 to 425℃ |
Suitable Medium |
Water, Oil, Gas, etc. |
|
Flange Standard |
ANSI, JIS, DIN, GB standard |
Types For Choice |
Rising stem gate valve, non-rising stem gate |
|
Pressure |
Class 150/Class 300/Class 600 |
Inspection and Test |
ISO5208, API598 |
|
Connection Dimension |
ASME B16.5, ASME B16.25 |
Face to Face |
ASME B16.10 |
|
Design & Manufacture |
ASME B16.34, API600 |
Optional Accessories |
Namur Solenoid Valve, Limit Switch, F.R.L, Position Indicator, Manual Device |
Product Overview
NEWWAY Zero-Leakage Direct-Buried Flat Plate Gate Valve: Underground Pipeline Fluid Control Solution
I. Product Overview
NEWWAY zero-leakage direct-buried flat plate gate valves are specially designed for underground pipeline systems, featuring fully sealed buried structures to eliminate space occupation and external damage of surface-mounted valves. Using a flat gate for flow cutoff, the valves adopt ductile iron (GGG50) or cast steel (WCB) bodies with double-layer anti-corrosion coatings, suitable for municipal water supply/drainage, gas, and heating underground pipelines. The innovative anti-settlement sealing structure resists soil displacement, with bidirectional zero-leakage performance certified to API 598, ideal for long-term maintenance-free underground networks.
II. Core Technical Parameters
Nominal Diameter: DN50-DN1200 (2″-48″)
Pressure Class: PN10/PN16/PN25 (1.0MPa/1.6MPa/2.5MPa)
Temperature Range: -20℃~120℃ (heating media), -40℃~60℃ (gas media)
Body Material: Ductile iron GGG50 (tensile strength ≥500MPa), cast steel WCB (tensile strength ≥485MPa)
Sealing System: Metal hard seal (STL overlay) + NBR soft seal, leakage rate ≤0.01% (bubble-tight)
Connection Types: Flanged (GB/T 9113, ASME B16.5), butt-welded (BW)
Protection Grade: IP68 (burial depth ≤6m), anti-soil corrosion compliant with NACE MR0175
III. Structural Design & Technical Features
Direct-Burial Optimization
Extended stem design (protrusion ≥300mm) with anti-theft ground operation well, preventing well water accumulation.
Three-layer anti-corrosion system (zinc-rich epoxy primer + fiberglass winding + polyurethane topcoat), salt spray test ≥3000h without corrosion.
Anti-Settlement Sealing Structure
Elastic compensation design between gate and seat allows ±5° axial deflection for uneven soil settlement.
Bellows compensator between bonnet and body absorbs thermal expansion displacement (compensation ≤8mm).
Low-Torque Operation System
Bevel gear reduction (3:1 ratio) reduces DN300 valve torque from 220N·m to 65N·m.
Trapezoidal thread stem (pitch 6mm) with self-lubricating bronze bushing, operation life ≥10,000 cycles.
IV. Manufacturing Processes & Quality Control
Precision Casting
Ductile iron castings use lost foam process with graphite spheroidization grade ≥2, eliminating shrinkage defects.
Cast steel parts normalized at 920℃ + tempered at 650℃, impact energy ≥34J at -20℃ (Charpy V-notch).
Surface Treatment Technology
Three-layer coating for body anti-corrosion:
Bottom: Zinc-rich epoxy primer (dry film 80μm)
Middle: Fiberglass reinforced layer (1.2mm)
Top: Weather-resistant polyurethane paint (RAL7035, dry film 100μm)
3D Quality Inspection
Pressure test: 1.5x shell strength (30min hold, no deformation), 1.1x sealing test (zero leakage).
Burial simulation: 6m hydrostatic pressure + soil pressure cycling (1000 cycles, no leakage).
NDT: 100% ultrasonic testing (UT), compliant with GB/T 2970 grade III.