Stainless Steel Flange Gate Valves

Bolaisi is a professional manufacturer and supplier, committed to producing high-quality American standard valves with strict quality control and advanced production processes. Our main product is Stainless Steel Flange Gate Valves, featuring reliable flanged connection, metal hard seal and excellent corrosion resistance. We offer customized specifications and wholesale services to meet the on-off needs of various industrial pipelines.

Core Technical Parameters

Product Overview

Z41H stainless steel flanged gate valve is a forced-seal valve made of full stainless steel, with flange as the main connection. Its closing member is a gate disc, whose movement direction is perpendicular to the flow direction. The valve is opened and closed by lifting the gate disc, precisely realizing the function of cutting off or connecting the medium.

Stainless Steel Flange Gate Valves are suitable for various working conditions and widely used in pipeline systems for water, steam, oil, corrosive media and general gas in chemical, petroleum, water treatment, metallurgy and other industries. With stable performance and wide applicability, they have become indispensable basic control equipment in pipeline systems of various industries.

The valve features reasonable structure and reliable sealing, can withstand long-term erosion and corrosion of different media, and meets the strict requirements in industrial production.

Core Attributes

● Structure Type: Outside Screw & Yoke, Rigid Wedge Disc. Stable structure, smooth opening and closing, easy to observe operation status and convenient for maintenance.

● Connection Type: Flanged Connection with RF raised face design, conforming to GB/T 9113 and HG/T 20592. Firm connection and excellent sealing performance to effectively prevent medium leakage.

● Sealing Type: Metal hard seal with hard alloy overlay on sealing surfaces, wear-resistant and erosion-resistant, stable sealing, zero leakage in hydrostatic test, suitable for high-pressure and impurity-containing conditions.

● Nominal Pressure: Covers PN10/PN16/PN25/PN40/PN63/PN100, flexible selection for low to high-pressure pipelines.

● Material Grade: Stainless steel body, optional 304/06Cr19Ni10, 316/06Cr17Ni12Mo2, excellent corrosion resistance for different media.

● Operation Mode: Manual (handwheel), electric, pneumatic. Flexible choice for different automation levels.

Model Interpretation

Each letter and number in model Z41H has a clear definition for buyers to quickly identify specifications:

● Z: Gate Valve, defines the main valve type for on/off service.

● 4: Flanged Connection, conforming to industrial flange installation standards.

● 1: Outside Screw & Yoke, Single Wedge Disc, featuring smooth operation and easy maintenance.

● H: Seat Face Overlayed with Hard Alloy, representing reliable sealing, wear resistance and erosion resistance.

Component Materials

All key components of Stainless Steel Flange Gate Valves are strictly selected for corrosion resistance, wear resistance and structural strength:

● Valve Body / Bonnet: 304 (06Cr19Ni10) or 316 (06Cr17Ni12Mo2) stainless steel, high strength and strong corrosion resistance.

● Valve Stem: 304/316 stainless steel, quenched and tempered for improved strength and wear resistance.

● Disc: Stainless steel substrate with hard alloy overlay, tough and wear-resistant.

● Valve Seat: Hard alloy overlay, precisely matched with disc for stable zero leakage.

● Gland Packing: Flexible graphite or PTFE, high temperature and corrosion resistant.

● Bolt / Nut: Stainless steel / alloy bolts, high strength and anti-rust.

Design & Manufacturing Standards

● Gate valve general specification: GB/T 12234

● Face to face dimension: GB/T 12221

● Flange dimension: GB/T 9113

● Pressure-temperature rating: GB/T 12224

● Valve test and inspection: GB/T 13927

Selection & Installation Points

Selection Points

● For highly corrosive media, 316 stainless steel is preferred; 316L is recommended for chloride-containing media.

● For high-temperature and high-pressure conditions (> 400℃, ≥ PN40), verify pressure-temperature rating per GB/T 12224.

● Choose operation mode: manual for small/low-frequency pipelines; electric/pneumatic for large/automated systems.

Installation Points

● Reserve enough space for stem lifting to avoid interference.

● Tighten flange bolts symmetrically and evenly to prevent leakage.

● Clean impurities, welding slag and oil inside the pipeline before installation.

● Conduct pressure test after installation to ensure no leakage before commissioning.

Product Advantage Summary

Z41H Stainless Steel Flange Gate Valves feature full stainless steel construction, stable metal hard seal, flexible operation modes and wide pressure range. They are widely applied in chemical, petroleum, water treatment and other industries.

The valves provide reliable sealing, easy operation and long service life, effectively solving pain points such as leakage, wear and poor operation. Manufactured in strict accordance with national and industrial standards, they are a reliable choice for on/off service in industrial pipelines under various pressure and medium conditions.