A Blind Flange (also known as a blanking flange) serves as the ultimate safety barrier in any piping architecture. At Jiangyin Zhonghai Precision Machinery Co., Ltd., our blind flanges are engineered not just to seal pipe ends, but to provide structural integrity during pressure testing, maintenance, and future system expansions.

By maintaining full supply chain control—from in-house forging to precision machining and heat treatment—we deliver blind flanges capable of withstanding extreme pressure loads and corrosive environments. Whether you require standard components or fully customized parts based on complex blueprints, Zhonghai Precision provides the mechanical reliability your infrastructure demands.

Core Advantages: Why Partner with Zhonghai?
·Fully Integrated Production: With our own forging, machining, and heat treatment facilities, we ensure every flange is monitored under a single, rigorous quality control system from raw ingot to finished product.
·Certified Quality Assurance: We are an ISO 9001 certified manufacturer with PED (Pressure Equipment Directive) and TS (Special Equipment Licensing) credentials, meeting the stringent entry requirements of global markets.
· Heavy-Duty Capabilities: Our production range spans from 1/2" to 60", with a maximum machining diameter of 4 meters and a single-component weight capacity of up to 10 tons.
 ·Global Standard Compliance: We manufacture strictly in accordance with ASME, ASTM, JIS, DIN, and EN standards, while offering 1:1 bespoke manufacturing for non-standard applications.

Key Features
 ·Superior Load & Tensile Strength: Utilizing premium forged steel and specialized heat treatment, our flanges eliminate internal stress to prevent deformation or cracking under long-term high-pressure service.
 ·Precision-Machined Sealing Surfaces: Our RF, RTJ, and FF faces undergo high-precision machining to ensure a zero-leakage interface with mating flanges.
 ·Diverse Material Grade Selection: Available in Carbon Steel, Stainless Steel, Alloy Steel, and Duplex Steel to suit various chemical, thermal, and mechanical requirements.
 ·Comprehensive Traceability & Testing: Every shipment is accompanied by a Material Test Certificate (MTC). Optional Non-Destructive Testing (NDT) including Ultrasonic (UT) and Magnetic Particle (MT) is available upon request.

Applications
Zhonghai Precision's blind flanges are trusted in industries where safety and durability are non-negotiable:
·Oil & Gas: Upstream wellheads, midstream pipelines, and storage terminal isolation.
· Chemical & Refining: Pressure vessel ports, reactors, and high-temperature processing lines.
· Power Generation: Water systems and steam cycles in thermal and nuclear power plants.
 ·Marine & Offshore: Ballast systems and equipment operating in high-salinity environments.
 ·Water Treatment: Large-scale municipal piping and industrial cooling loops.