Plastic Flanged Gate Valve
This industrial plastic flanged gate valve provides bi-directional, tight shut-off control for corrosive liquids, deionized water, and chemical slurry streams.
Description
Product Overview
This industrial plastic flanged gate valve provides bi-directional, tight shut-off control for corrosive liquids, deionized water, and chemical slurry streams. Built with a non-rising stem structure and full-port fluid path, it eliminates flow restrictions, minimizes pressure drops, and resists internal scale buildup. The ANSI/DIN flanged connections integrate directly into thermoplastic and lined piping systems, preventing stress cracking caused by uneven flange torque.
Key Product Characteristics
Full-Bore Flow Path: Matches line inner diameter to lower friction loss and allow passage of mild solids or slurry.
Corrosion-Proof Construction: Eliminates external coating maintenance and galvanic corrosion in aggressive acid/alkali environments.
Non-Rising Stem (NRS): Keeps vertical height compact for tight vault installations and underground valve boxes.
Bi-Directional Sealing: Holds tight shut-off regardless of flow direction, simplifying orientation during installation.
Low Operating Torque: Precision-cut trapezoidal stem threads lower turn resistance without requiring mechanical gear operators on standard sizes.
Key Specifications
|
Parameter |
Specification / Value |
|
Nominal Diameters |
DN50 – DN300 (2" – 12") |
|
Pressure Rating |
PN10 / PN16 (150 PSI at 20°C / 68°F) |
|
Temperature Range |
PVC-U: 0°C to 60°C (32°F to 140°F) |
|
Flange Standards |
ANSI B16.5 Class 150 / DIN EN 1092-1 PN10/PN16 / JIS 10K |
|
Face-to-Face Standard |
ISO 5752 / EN 558-1 Series 14 |
|
Leakage Class |
ISO 5208 Rate A (Zero Visible Leakage) |
|
Operation Type |
Manual Handwheel, Bevel Gearbox, or ISO 5211 Electric/Pneumatic Actuation |
Materials & Media Compatibility
Body & Gate Materials
PVC-U: Water treatment, general acid/alkali transfer, brine solutions.
CPVC: Hot corrosive fluids, elevated temperature chemical processing.
PPH: Industrial waste streams, pickling lines, high-pH chemical media.
PVDF: Ultra-pure water (UPW), concentrated acids (HNO3, H2SO4), halogenated solvents.
Seals & O-Rings
EPDM: Water, dilute acids, alkalis, alcohols (not suitable for oils/petroleum).
FKM (Viton): Concentrated acids, petroleum products, aromatic hydrocarbons, high-temperature fluids.
Stem: 316 Stainless Steel (Standard), Titanium Grade 2 (Optional for high-chloride/bleach media), or fully encapsulated plastic stem.
Connection & Configuration Options
Flange Drilling patterns: Multi-drilled bolt circles compatible with ANSI Class 150 and DIN PN10/16 layout.
Seat Types: Soft EPDM/FKM resilient seat or solid PTFE wedge guide insert.
Actuation Interfaces: Top flange machined to ISO 5211 standard for field-mounting pneumatic double-acting/spring-return cylinders or 24V/220V electric actuators.
Accessories: Limit switch boxes, stem extensions, lock-out/tag-out (LOTO) handwheel brackets.
Application-Specific Design Considerations
Thermal Expansion: Thermoplastics exhibit higher thermal expansion coefficients than metallic piping. Installation requires expansion loops or flexible joints on long straight runs above 40°C.
Flange Bolting Torque: Requires flat-face matching flanges. Bolts must be torqued in a star pattern to specified values (e.g., 25–30 Nm for DN100) using elastomeric gaskets to prevent flange ear cracking.
Media Velocity Limits: Recommended maximum fluid velocity is 3 m/s for liquid media to prevent water hammer damaging the wedge guide tracks.
Applications
Industrial Wastewater Treatment: Isolation of primary sludge, chemical dosing lines, and neutralization tanks.
Chemical Processing: Handling hydrochloric acid, sulfuric acid, sodium hydroxide, and ferric chloride lines.
Desalination & Marine Systems: Seawater intake isolation, reverse osmosis (RO) reject lines, and brine recirculation.
Semiconductor & Electronics: Ultra-pure water distribution mains using high-purity PVDF bodies.
Aquaculture & Mining: Recirculating aquaculture systems (RAS) and acid mine drainage slurry containment.
Quality & Inspection
Each valve undergoes factory testing according to international standards before dispatch:
Shell Hydrostatic Test
Tested at 1.5x nominal pressure rating (PN16 tested at 24 bar / 348 PSI) to ensure body structural integrity.
Seat Sealing Test
Tested at 1.1x nominal pressure rating (pneumatic/hydrostatic) to verify zero-seat-leakage compliance per ISO 5208 Rate A.
Dimensional Verification
100% check on face-to-face dimensions, flange pitch circle diameter (PCD), and bolt hole alignment.
Material Traceability
Spectrometric analysis for stainless steel stems and raw polymer batch certification (MTR) provided with shipment.
OEM / ODM & Customization
We support custom engineering requirements for volume equipment integration and private-label distribution:
Custom Color & Branding: Private-label handwheel molding, custom body colors, and laser-engraved serial tags.
Specialized Stem Alloys: Hastelloy C-276, Monel 400, or Duplex 2205 stems for extreme chemical or off-shore applications.
Modified Face-to-Face Dimensions: Custom body lengths matching legacy cast iron gate valves for drop-in retrofit projects.
Custom Actuation Assemblies: Factory assembly and calibration of client-specified actuator brands and positioners.
FAQ
Q: What is the primary advantage of choosing a plastic gate valve over a metal gate valve?
A: Plastic gate valves eliminate internal oxidation, scaling, and chemical corrosion in aggressive chemical or salt-water lines without requiring protective coatings, epoxy linings, or costly exotic alloys.
Q: Can this plastic gate valve be used for throttling or flow regulation?
A: No. Gate valves are designed strictly for full-open or full-closed isolation service. Operating the valve in a partially open position causes fluid velocity to vibrate the gate inside the guides, leading to premature seat wear and stem fatigue.
Q: How do I select between EPDM and FKM seal materials?
A: Select EPDM for general water systems, dilute acids, alkalis, and alcohols. Select FKM for concentrated mineral acids, aromatic hydrocarbons, oils, or operating temperatures exceeding 80°C.
Q: Are the flanged dimensions compatible with existing metal piping networks?
A: Yes. The flange bolt patterns conform to ANSI B16.5 Class 150 and DIN EN 1092-1 PN10/PN16. They drop directly into matching metal or plastic counterpart flanges using standard flat gaskets.
Q: What torque settings should be used when bolting thermoplastic flanges?
A: Thermoplastic flanges require lower torque than steel flanges and must be tightened in a star-pattern sequence with a calibrated torque wrench. Over-tightening can crack plastic flange eyes. Specific torque tables (ranging from 15 Nm for DN50 up to 70 Nm for DN300) are detailed in the installation manual.
Q: What certifications and material test reports (MTR) accompany bulk shipments?
A: Standard shipments include ISO 9001 factory inspection certificates, hydrostatic/pneumatic test reports per ISO 5208, and raw material compliance data sheets. Food-grade or drinking water certifications (such as NSF/ANSI 61 or WRAS compliance) can be supplied upon request.
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