Stainless Steel Forged Steel Butt Welding Gate Valves

As a reliable manufacturer with strict quality control, Bolaisi specializes in producing high-pressure forged steel valves using advanced forging and hardfacing technology. We supply Stainless Steel Forged Steel Butt Welding Gate Valves, featuring integral forged bodies, Stellite overlay seals and excellent high-temperature resistance. We offer customized pressure classes and wholesale services to meet harsh industrial working conditions.

Technical Parameters

Definition

Z61Y Forged Steel Stainless Steel Overlay Gate Valve is a manual high-pressure gate valve specially designed for high-temperature, high-pressure and highly corrosive conditions. It features a fully forged body, welded connection, hard alloy overlay sealing surfaces, and outside screw & yoke single wedge disc structure.

With Stellite or other high-grade hard alloy overlay on sealing surfaces, it excels in high temperature resistance, wear resistance, galling resistance and strong corrosion resistance. It is widely used in petrochemical, offshore oil & gas, pharmaceutical and chemical industries for on-off control of high-temperature, high-pressure and corrosive media, with high reliability and long service life.

Stainless Steel Forged Steel Butt Welding Gate Valves can withstand severe working conditions thanks to integral forging and precision hardfacing technology.

Product Advantage

Z61Y Stainless Steel Forged Steel Butt Welding Gate Valves feature integral forged body, precision hard alloy overlay, and excellent high-temperature, wear and corrosion resistance. Designed for severe conditions in petrochemical and offshore industries, they provide reliable zero-leakage sealing, robust structure and long service life.

Manufactured in strict accordance with API 602, ASME and other international standards, they effectively solve pain points such as corrosion, leakage and short service life. They are a reliable solution for on-off control in high-temperature, high-pressure and corrosive pipelines with low maintenance cost.

Model Interpretation

Take Z61Y-1500LB-F316 DN25 as an example:

● Z: Gate Valve, for on-off service of high-temperature, high-pressure and corrosive media.

● 6: Welded Connection, including Socket Weld (SW) and Butt Weld (BW).

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

● Y: Seat Face Overlayed with Hard Alloy, for wear, corrosion and high temperature resistance.

● 1500LB: Pressure Class 1500, for high-pressure service.

● F316: Forged 316 stainless steel body, for chloride-containing and strong corrosive media.

● DN25: Nominal Diameter.

Core Attributes

● Structure: Outside Screw & Yoke Rigid Wedge Disc, integral forged body, high strength, anti-deformation.

● Connection: Welded (SW / BW), firm and reliable for high-temperature & high-pressure conditions.

● Seal: Metal hard seal with Stellite 6/12 overlay, zero leakage, meets API 598 / API 602.

● Actuation: Manual standard; gear, electric, pneumatic, bevel gear available.

● Material: Forged stainless steel F304/F304L/F316/F316L/F321, excellent corrosion & heat resistance.

● Pressure & Size: Class 150~2500 (PN16~PN420), mainly DN15~DN50 (NPS ½"~2"), up to DN10~DN200.

● Bonnet: Bolted, welded or pressure self-sealing bonnet; self-sealing for ultra-high pressure.

Component Materials

● Valve Body / Bonnet: Forged F304/F304L/F316/F316L/F321 stainless steel, integral forged.

● Disc: Forged stainless steel + Stellite 6 overlay, hardness ≥ HRC 40.

● Valve Seat: Forged stainless steel + Stellite overlay, stable zero-leakage sealing.

● Valve Stem: Forged 304/316/316L, nitrided for wear and corrosion resistance.

● Gland Packing: Flexible graphite with nickel wire (high temp); PTFE with stainless steel (low temp).

● Handwheel: Forged stainless steel, anti-slip design.

● Fasteners: 304/316 stainless steel bolts, nuts, gaskets.

Design & Manufacturing Standards

● Forged valve design: API 602, GB/T 12224

● Welded ends: ASME B16.11, ASME B16.25

● Pressure-temperature rating: ASME B16.34

● Inspection & test: API 598, GB/T 13927, ASTM G48

● Overlay: JB/T 4747

● Forged material: ASTM A182

Selection, Installation & Maintenance Points

Selection Points

● F304/F304L for general corrosion; F316/F316L for chloride & strong acid; F321 for high temperature.

● Socket Weld for vibrating lines; Butt Weld for large bore & high flow.

● Gear assist for Class 1500 and above; electric/pneumatic for automation.

Installation Points

● Clean and passivate forged stainless steel surfaces before installation.

● Use proper welding wire (e.g. ER316L) and perform post-weld heat treatment & pickling passivation.

● Reserve enough space for stem operation and maintenance.

● Conduct shell and seal test per API 598 before commissioning.

Maintenance Points

● Lubricate packing regularly with special lubricant for forged stainless steel.

● Check sealing and corrosion every 6 months.

● Repair sealing surfaces by Stellite overlay to restore performance.

● Clean media and protect against corrosion during long-term shutdown.