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Poly-Gas® Ball Valve, Gas Ball Valve, Polyethylene Gas Ball Valve

Poly-Gas® polyethylene gas ball valves are valves specifically designed for controlling the flow of natural gas or gaseous propane through polyethylene (PE) piping systems. Polyethylene is a durable and flexible plastic material commonly used for gas distribution systems due to its excellent resistance to corrosion, chemicals, and stress cracking.

Polyethylene gas valves are typically made from high-density polyethylene (HDPE) or medium-density polyethylene (MDPE), which are both suitable for gas applications. These valves are engineered to meet the requirements and standards of gas distribution, ensuring safety and reliability.

It's important to note that installation, maintenance, and compliance with local regulations and codes are essential for the proper use of polyethylene gas valves and the overall safety of gas distribution systems. 

Before making your final determination on valve suitability for your specific application and compatibility with the chemicals and conditions it will be exposed to, please contact our customer service specialists

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Product Features & Benefits

  • POLYETHYLENE: Corrosion-free due to high-grade polymeric materials. There are no metal internal parts.
  • RUGGED AND RELIABLE: Polyvalve Poly-Gas® valves are the strongest part of a polyethylene piping system.
  • FUSED BODY SHELL: The fused body shell removes leak paths to the atmosphere.
  • ENHANCED SEALING PERFORMACE: Multiple elastomeric stem seals provide improved sealing efficiency compared to a single seal. The additional seals create multiple barriers, reducing the chances of leakage and ensuring a tighter seal.
  • BUBBLE-TIGHT SHUTOFF AND DUAL ELASTOMERIC SEATS: By combining the bubble-tight shutoff and dual elastomeric seats, the valve can provide an enhanced sealing performance. The dual elastomeric seats ensure a tight seal by deforming and conforming to the valve's surfaces, while the bubble-tight shutoff guarantees zero leakage by preventing any fluid or gas from passing through the valve when it is fully closed.
  • SMOOTH BORE: The smooth bore gives excellent flow characteristics in both full and reduced port designs.
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Why use Poly-Gas® Valves?

Polyvalve is the first company to manufacture polyethylene (PE) valves for natural gas distribution.

Millions of Polyvalve Poly-Gas® valves have been sold since 1976 and are in use throughout the world. Here’s why:

  • Rugged and reliable Polyvalve Poly-Gas® valves are the strongest part of a Polyethylene piping system.
  • No metal internal parts.
  • Bubble-tight shutoff from dual elastomeric seats.
  • Fused body shell eliminates leak paths to atmosphere.
  • High-grade polymeric materials eliminate corrosion.
  • Multiple elastomeric stem seals.
  • Smooth bore gives excellent flow characteristics in both full and standard port designs.

Technical Details

Design Features

Materials of Construction

(detailed material breakdown can be found under Product Literature)

Item 1/2" through 2" Polyvalve II (C-Style) 2" through 16"
Body Polyethylene Polyethylene
Ball Acetal Polypropylene
Seat Retainer Acetal Polypropylene
Seat Buna N Buna N
Stem Stainless Steel Acetal
Stem Seal Buna N Buna N
Ground Water Seal Neoprene Neoprene
Wrench Adapter Acetal Polypropylene*
Adaptor Screw Stainless Steel  
Adaptor Button Acetal  


*Note: 16" has gear box and cast iron 2" square nut adaptor. 8" will have a choice of either gearing or wrench. 1¼" and 2" C-style is Standard Bore only. Available in copper tubing standard size (CTS).

Body Materials Chart

Resin SupplierMaterial DesignationColorASTM Material DesignationMaterial Density
CP ChemTR-418 (D6500)YellowPE 2708/2406Medium
DowDGDA 2490 (UAC3700)BlackPE 4710/3408High

*Note: On 8” full bore and 12” full bore only the main body section is in DGDA 2490 material. Different pipe ends are fused on to suit customer’s specific material requirements.

Pressure Ratings

Maximum Design Pressure rating per 49 CFR §192.121 for Dry Natural Gas Service

MDPE PE2708 Yellow Pipe (Design Factor 0.40)
Size Dimension Ratio (DR) or Wall Thickness (WT) 73°F (23°C) (PSIG) 100°F (38°C) (PSIG) 120°F (48°C) (PSIG) 140°F (60°C) (PSIG)
1/2" CTS 0.090 WT 125+ 125+ 125+ 107
1/2" IPS 0.090 WT 120 96 96 77
3/4" CTS 0.090 WT 115 92 92 74
1" CTS 0.119 WT 100 80 80 64
3/4" IPS - 12" IPS DR 10.0 111 89 89 71
  DR 11.0 100 80 80 64
  DR 13.5 80 64 64 51
  DR 17.0 63 50 50 40
HDPE PE4710 Black Pipe (Design Factor 0.40)
Size Dimension Ratio (DR) or Wall Thickness (WT) 73°F (23°C) (PSIG) 100°F (38°C) (PSIG) 120°F (48°C) (PSIG) 140°F (60°C) (PSIG)
1/2" CTS 0.090 WT 125+ 125+ 125+ 125+
1/2" IPS 0.090 WT 125+ 120 96 96
3/4" CTS 0.090 WT 125+ 115 92 92
1" CTS 0.119 WT 125+ 100 80 80
3/4" IPS - 12" IPS DR 9.0 125+ 125 100 100
  DR 9.3 125+ 120 96 96
  DR 10.0 125+ 111 89 89
  DR 11.0 125+ 100 80 80
  DR 13.5 102 80 64 64
  DR 17.0 80 63 50 50
16" IPS DR 11.0 100+* 80* 64* 64*
  DR 17.0 64* 50* 40* 40*
† 49 CFR Part §192.121 limits design pressure to 125 psig for pipe ≤12" IPS and 100 psig for pipe >12" IPS.
* Uses a Design Factor of 0.32. Exceeds the size inclusion of 49 CFR Part §192.121 for 0.40 design factor.

Codes and Standards

  • Polyvalve Poly-Gas® valves meet or exceed the requirements of:
    • ANSI B16.40
    • ASTM D-2513
    • S. Department of Transportation 49CFR, Part 192
  • In addition, as required by customers, certain sizes and materials of valves meet or exceed the requirements of CSA B137.0 and B137.4.
  • Certain Polyvalve Poly-Gas® valves have successfully passed 10,000-hour tests to ISO 4437.
  • Polyvalve is an ISO 9001 certified company.

Size Range

  • ½" - 16"

Temperature Range

  • -20°F - +140°F


  • Natural gas distribution
  • Natural gas gathering
  • Landfill gas (methane)
  • Hydrocarbon fuel gases
  • Hydrogen
  • Air
  • Other inert gases (helium, argon, neon)
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How to order Polyvalve Poly-Gas® Ball Valves can be found in the Polyvalve Poly-Gas® Ball Valve brochure above or by contacting our sales support team

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