The 316L grade (molybdenum-bearing austenitic stainless steel) delivers excellent resistance to chlorides, pitting, and crevice corrosion in acidic or alkaline media. Meanwhile, the non-rising stem (also known as an inside screw or dark stem) design means the stem does not move vertically during operation, making it ideal for pipelines with limited headroom or buried installations. This article provides a clear market price reference and a complete set of technical selection parameters for the DN80 size.The main gate valve product names of China gate valve Network include:API Bellows gate valve,API Manual Lug&wafer Knife-shaped Gate Valve

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1. Price Reference for Stainless Steel 316L Non-Rising Stem Gate Valve DN80

The price of a DN80 316L non-rising stem gate valve varies significantly based on brand, sealing type (metal-seated / soft-seated), and fluctuating raw material costs. Below are current market reference points (in CNY/RMB; for international buyers, please convert via current exchange rates and add shipping, duties, and VAT where applicable)

Premium / Branded Segment: For a well-known domestic brand such as Yuanda Valve, the 316L stainless steel flanged gate valve (model Z41W-16RL, DN80, wedge-type, hard-seated with 316L sealing face) is quoted at approximately ¥3,659/piece (tax-inclusive) on authorized B2B platforms like Vanguard (Xiyu). This represents the higher-quality tier with full 316L wetted parts.

Economy / Standard Segment: Some manufacturers or online suppliers offer similar DN80 non-rising stem resilient-seated gate valves (e.g., series Z45X-16P, with 304 or 316L body and EPDM-lined soft seal) at much lower prices, with quotes around ¥790/piece. These are suitable for clean water or mild-service conditions.

Key Pricing Drivers: The main cost factors include:

Body wall thickness (cast vs. forged, and pressure rating).

Stem material – whether using 2Cr13 (martensitic stainless) or true 316L stem.

Seat type – EPDM/PTFE soft-seated (lower cost, lower temperature) vs. Stellite or alloy hard-facing (higher cost, high-temperature / abrasive service

Procurement Tips: Always confirm whether the quoted price includes flange gaskets, bolts/nuts, and VAT invoice (for domestic China purchases). For high-temperature steam, corrosive acids, or abrasive slurries, we strongly recommend selecting the hard-seated (metal-to-metal) version with Stellite overlay on sealing surfaces – though more expensive, it ensures longer service life and reliability.

2. Core Technical Selection Parameters for DN80 316L Non-Rising Stem Gate Valve

To ensure proper fit and performance, besides the nominal size DN80 and pressure rating PN16 (1.6 MPa / Class 150 equivalent), the following critical dimensional and material specifications must be verified before ordering:

2.1 Face-to-Face & Flange Dimensions

Face-to-face dimension (structural length, L) – The standard length for DN80 flanged non-rising gate valves is typically 203 mm (short series per GB standards). However, German DIN or other international standards (e.g., EN, ASME) may differ slightly. Always cross-check with the piping layout drawings.

Flange outer diameter (D) – For PN16 rating, the flange outer diameter is normally 200 mm.

Bolt circle diameter (D1) – 160 mm

Bolt hole configuration – 8 holes of Φ19 mm (8-M19 bolts).

Overall height – Thanks to the non-rising stem design, the total height is relatively low, approximately 265 mm (much shorter than an outside-screw-and-yoke OS&Y gate valve), making it perfect for confined pits or low-clearance installations.

2.2 Material Specifications (Wetted Parts)

Body, Bonnet, and Wedge/Disc – Must be clearly specified as CF8M (ASTM A351) – the cast equivalent to wrought 316L stainless steel. Request solution-annealed heat treatment certification to guarantee resistance to intergranular corrosion.

Stem – Material should not be lower than 06Cr19Ni10 (Chinese GB equivalent) or AISI 304; for more aggressive chloride environments, specify 316/316L stem as well.

Stem nut / yoke bushing – Typically made of cast aluminum bronze or high-strength brass, with hardness deliberately higher than the stem to prevent galling and thread wear.

Seat / Sealing options – Two main types:

Soft-seated (Resilient) – EPDM or PTFE lining, offering zero-leakage shutoff but limited to ≤80°C (suitable for water, wastewater, and mild chemicals).

Metal-seated (Hard-faced) – Stellite 6 or cobalt-based alloy overlay on both wedge and seat rings, capable of temperatures up to 200°C or higher (ideal for saturated steam, thermal oil, and abrasive media).

2.3 Operating Torque & Applicable Standards

Manual operating torque – Under rated working pressure, the maximum recommended operating torque for handwheel operation is ≤240 N·m, ensuring single-person operation without excessive effort.

Design & manufacturing standards – In China, follow GB/T 12232 (for iron/steel gate valves) or GB/T 12234 (for pressure-tight bonnet valves). For international projects, confirm compliance with API 600 or ASME B16.34 if required.

Inspection & testing – Hydrostatic shell test and seat leakage test shall comply with GB/T 13927 (or ISO 5208). Ensure the supplier provides a factory test report with actual test pressures and holding times.

Summary & Purchasing Checklist

To recap, the Stainless Steel 316L Non-Rising Stem Gate Valve DN80 has a wide price range – roughly ¥790 to ¥3,659 per unit – depending on brand reputation, sealing material, and whether the valve is hard-seated or soft-seated. For selection, the three most critical parameters to confirm are:

Face-to-face length (L=203 mm) – match your existing flange spacing

Flange dimensions (D=200 mm, 8×Φ19 holes) – match your mating pipe flanges.

Seat material and temperature rating – soft-seated for cold water, hard-seated for steam/high-temperature service.

Final procurement advice: Always request a certified mill test report (MTR) showing the chemical composition and mechanical properties of the CF8M body, plus an outline dimensional drawing with flange drilling details. This prevents costly installation mismatches and ensures long-term corrosion resistance in your specific process environment.

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