Check valve

‌JIS20K升降式止回阀SCS13（带旁通缓闭功能）‌It is a high-pressure check valve that complies with Japanese Industrial Standards (JIS) and is designed for harsh working conditions. It is suitable for high-pressure, high flow rate, and pipeline systems that are prone to water hammer. The "20K" in the model indicates a pressure rating of 20K (approximately equivalent to PN40/Class 300), with a maximum pressure capacity of 4.0MPa; The material corresponding to "SCS13" is ASTM CF8 (304 stainless steel), which has excellent corrosion resistance and high temperature stability. Its "lifting" structure achieves one-way flow control of the medium through vertical lifting of the valve disc, combined with bypass and slow closing functions, effectively reducing water hammer impact and improving system safety.

‌核心结构与功能‌

• ‌阀体与阀瓣‌The valve body is made of SCS13 (304 stainless steel) casting, and the internal valve disc is designed for lifting and opening. It relies on the pressure of the medium to lift and open, and gravity or spring assistance to close. The sealing surface is usually welded with hard alloy or made of rubber/PTFE material to ensure zero leakage under high pressure.
• ‌旁通装置‌Integrated bypass pipeline and small shut-off valve can balance upstream and downstream pressure before the main valve is opened, reduce opening and closing impact, and facilitate system exhaust or medium pre circulation.
• ‌缓闭机构‌By using hydraulic damping or mechanical delay devices, the valve disc is slowly closed in stages, significantly reducing the water hammer effect caused by pump stoppage or sudden flow changes, and protecting pipelines and equipment.

‌技术特点‌

1. ‌高压耐受‌Compliant with JIS20K standard, suitable for 4.0MPa high-pressure environment, with reinforced valve body structure design and strong impact resistance.
2. ‌双重防护‌The bypass valve balances pressure and the slow closing mechanism suppresses water hammer, making it particularly suitable for long-distance water transportation, pump stations, and industrial circulation systems.
3. ‌耐腐蚀性‌304 stainless steel material is resistant to weakly corrosive media such as steam and industrial wastewater, and has stable performance at high temperatures (up to about 400 ℃).
4. ‌维护便捷‌The valve cover is designed to be detachable, making it easy to clean the valve chamber or replace seals; The bypass valve can also serve as a maintenance channel.

‌应用场景‌
Widely used in steam systems of thermal power plants, high-pressure pipelines of petrochemicals, ship power equipment, and water supply and drainage engineering, especially suitable for situations where pump outlets require anti backflow and high water hammer risks. During installation, it is necessary to ensure that the flow direction of the medium is consistent with the arrow on the valve body, and regularly check the sensitivity of the slow closing device and the wear of the sealing surface.

JIS 20K lift check valve is a flange connection, also known as flange spring check valve, mainly made of stainless steel SCS13 and SCS14. It is recommended to install vertically and use springs to reset the interior.

The valve adopts the Japanese JIS 20K standard and is composed of a valve plate, spring, and guide valve inside, which can play a role in micro resistance and slow closing.

We also have JIS 10K lift check valves for you to purchase