Recently, DERVOS Valve successfully passed the audit by the American Petroleum Institute (API). The company’s API Spec 6D certification for pipeline valves has been renewed, and the API 600 certification has also been issued. Both certificates are valid through 2029.   What is an API6D certificate?   API 6D is an internationally recognized standard for valves used in oil and gas pipeline transportation systems. It covers the full process requirements for design, manufacturing, and inspection of products such as ball valves, gate valves, and check valves. The certification typically requires renewal audits every three years.     What is an API600 certificate?   API 600 is an internationally recognized standard for steel gate valves used in oil and gas refinery applications. It defines requirements for design, materials, manufacturing, inspection, and testing. This certification is generally subject to renewal every three years to maintain validity.   According to available information, the audit covered multiple aspects, including quality management system operation, production process control, inspection equipment calibration, and personnel qualifications. During the audit, the API inspection team conducted an on-site review of the entire process at DERVOS Valve, from raw material procurement to final product delivery.   A representative from the company’s quality department stated that DERVOS Valve has been continuously improving its standardized system management and has established a quality control system covering the full product lifecycle. Key production processes are supported by standardized work instructions, and inspection records are fully traceable to individual orders.   The successful renewal of these certifications demonstrates that DERVOS Valve continues to meet API requirements in product manufacturing and quality assurance within the industrial valve sector. It also supports the company’s qualification to supply products for international projects such as oil and gas pipelines and LNG receiving terminals.   The company stated that it will continue to focus on standardized production and process management to ensure the effective operation of its quality management system.

Gate valves and blind valves are both used for pipeline isolation, but they operate on fundamentally different principles.In industrial piping systems, if the objective is true physical isolation (positive isolation), then a blind valve (Blind Valve / Line Blind Valve) is generally more reliable than conventional valves. Instead of relying on seat sealing, it isolates the medium through a solid blind plate, which defines both its application scope and engineering value. The key features of a blind valve can be understood from an engineering perspective as follows:   1. Absolute Physical Isolation   If zero leakage is required, then conventional valves (such as gate valves or ball valves) introduce risk, as their performance depends on sealing integrity. Blind valves follow a different logic: ▶ If a solid plate is inserted, then the flow is completely blocked▶ If the blind plate is correctly positioned, then sealing failure is no longer a concern This makes blind valves more suitable for:         ● Oil & gas pipeline isolation         ● Flammable media (petroleum, LNG, chemicals)         ● High temperature steam systems   Engineering conclusion:If the project requires verifiable isolation, then a blind valve should be prioritized over sealing-dependent industrial valves.   2. Inline Operation Capability   Traditional spade and spacer blinds typically require flange disassembly, which increases operational complexity and introduces safety risks. Blind valves (such as sliding blind valves and swing blind valves) are designed with a different approach: ▶ If frequent switching between operation and maintenance is required, then manual intervention must be minimized▶ If shutdown is not permitted, then switching must be performed under pressurized pipeline conditions (subject to specific design) Therefore:         ● Sliding Blind Valve: suitable for limited space and higher automation requirements         ● Swing Blind Valve: simple structure, suitable for medium to low switching frequency         ● Spectacle Blind Valve: suitable for low-frequency operation and cost-sensitive projects   Engineering conclusion:If maintenance is frequent or shutdown is not feasible, then a blind valve with inline operation capability should be prioritized.   3. Mechanical Reliability   The reliability of a blind valve does not depend on complex sealing systems, but on:         ● Mechanical structural stability         ● Material strength (such as A105, WCB, F22, LF2)         ● Actuation method (manual, gear-operated, or hydraulic) ▶ If the service conditions involve high temperature, high pressure, or corrosive media, then sealing-based valves are more prone to failure▶ If...

Choosing the right industrial valve type is one of the most critical decisions in system design. A poor selection—even when using high-quality valves—can lead to leakage, pressure loss, vibration, frequent maintenance, and long-term operational inefficiency. This guide covers the main industrial valve types, their applications, advantages, and limitations, along with practical insights to help you make the right valve selection for your project in 2026.   What Are Industrial Valve Types? Industrial valve types refer to different valve designs used to control, regulate, or isolate fluid flow in piping systems. Each type is engineered for a specific function—such as shut-off, throttling, or backflow prevention—and selecting the correct type is essential for system safety and efficiency.   5 Main Industrial Valve Types and Their Applications 1. Ball Valve Best for: Quick shut-off and low pressure drop Ball valves use a rotating ball with a straight-through bore. When fully open, they provide minimal resistance, making them one of the most efficient options for fluid transmission. Common applications:      ● Oil and gas pipelines      ● High-pressure systems      ● Frequent on/off operations Selection notes:      ● Full-port designs minimize energy loss      ● Metal-seated ball valves perform better in abrasive or high-cycle conditions   Avoid if:Precise flow control is required. Throttling with a ball valve can damage sealing surfaces over time.   2. Gate Valve Best for: Isolation service with minimal flow resistance Gate valves operate by lifting a gate out of the flow path. They are widely used in large-diameter pipelines where full open or full close operation is required. Common applications:      ● Long-distance transmission pipelines      ● Water treatment systems      ● High-temperature steam lines Selection notes:      ● Near-zero pressure drop when fully open      ● Wedge gate valves provide better sealing in high-temperature conditions   Avoid if:Frequent operation or throttling is required. Gate valves are not designed for repeated cycling.   3. Globe Valve Best for: Precise flow regulation Globe valves force fluid through a controlled flow path, allowing accurate throttling and stable flow control. Common applications:      ● Steam systems      ● High-temperature processes      ● Flow regulation applications Selection notes:      ● Excellent throttling performance      ● Stable operation under fluctuating flow conditions   Avoid if:Pressure drop must be minimized. Globe valves inherently create higher flow resistance.   4. Check Valve Best for: Automatic backflow prevention Check valves operate automatically based on flow directi...