Views: 0 Author: J-VALVES Publish Time: 2026-07-18 Origin: Site
In large-scale oil & gas, thermal power generation, and long-distance crude oil transmission pipelines, sudden medium shutdown will generate intense water hammer, which can rupture pipelines, damage pump bodies and flanges. Ordinary swing check valves close rapidly, and instantaneous high-pressure impact can easily trigger safety accidents.
A micro-resistance slow closing check valve integrates a damped hydraulic buffer actuator, featuring a two-stage closing mode: it quickly cuts off medium backflow in the early stage and slowly seals the sealing surface in the later stage, reducing water hammer pressure by more than 90%. The 24-inch large-bore Class 1500 high-pressure model is an essential product for heavy-duty pipelines.
The J-VALVES 24" Class 1500 WCB micro-resistance slow closing check valve shown in the photo adopts cast WCB valve body, forged lever plus red hydraulic damping cylinder, and an overall forged-welded structure, complying with global oil & gas industry standards ASME B16.34 and API 6D.
Customized Process for High-Pressure Large Bore, Compatible with Class 1500 ~ 2500 Pressure Classes
We own self-operated casting and forging workshops. The 24-inch Class 1500 valve body undergoes integral casting and non-destructive testing. Material options include WCB, LCB, F304 stainless steel; butt-welded, flanged and lug ends are all available to fit high-pressure working conditions of power plants and long-distance oil & gas pipelines.
Independently Developed Hydraulic Slow Closing Damping System with Adjustable Buffer
Equipped with self-developed red hydraulic buffer cylinder and external lever transmission structure, the slow closing delay can be adjusted on-site from 1 to 30 seconds. The micro-resistance flow channel design greatly lowers medium flow resistance compared with similar domestic valves and cuts pipeline energy consumption.
Full API 6D Certification for Compliant Global Exports
Founded in 2009, all our slow closing check valves have passed API 6D, ISO and CE pressure equipment certifications. Every valve undergoes 100% factory hydrostatic and air tightness testing with material flaw detection, eliminating qualification barriers for customs clearance in European, American and Middle Eastern projects.
Heavy-Duty Impact-Resistant Structure with Extended Service Life
Stellite hard alloy overlay is welded on the valve disc sealing surface, and stainless steel anti-corrosion valve shafts are adopted. The split design of external damping bracket allows maintenance without dismantling the entire valve body, cutting operation and maintenance costs by 60%.
One-Stop Complete Engineering Supporting Service with On-Site Technical Survey
Different from ordinary trading companies, J-VALVES equips fluid mechanics engineers to customize slow closing check valve parameters according to pipeline flow, pump power and medium temperature, and provide complete water hammer simulation calculation reports.
Project Parameters:DN600 (24") Class 1500 WCB slow closing check valve for high-temperature crude oil transportation, total pipeline length 120km
Original Pain Point: Frequent water hammer caused by conventional swing check valves led to monthly gasket replacement and flange maintenance.
J-VALVES Solution: Custom hydraulic micro-resistance slow closing check valves with 12-second delay. After installation, zero pipeline impact failures for 3 consecutive years, earning us the title of Annual High-Quality Supplier from the local oil group.
Demand: 24-inch high-pressure slow closing check valves to resist water hammer caused by pump shutdown for high-temperature circulating water
Project Outcome: Bulk supply of 42 sets of 24" Class 1500 WCB micro-resistance slow closing check valves, matched with the power plant DCS linkage damping mechanism. The peak water hammer pressure dropped by 87% the moment pumps shut down, and the product passed long-term acceptance of the local power group.
Water hammer hazards are the biggest operation and maintenance challenge for large-bore Class 1500 high-pressure pipelines. J-VALVES has focused on industrial check valve manufacturing since 2009, with self-developed hydraulic slow closing structures, full standard certifications and proven global engineering cases. Our 24-inch WCB micro-resistance slow closing check valve delivers long-term safety solutions for petroleum, thermal power and chemical pipelines, supporting drawing customization and bulk overseas exports.
