Rising Stem Flexible Wedge Gate Valve in Cast Iron for Industrial Flow Control

Rising Stem Flexible Wedge Gate Valve is a high-performance isolation valve engineered for demanding industrial service. Its defining features are the flexible wedge disc and the outside screw and yoke (OS&Y) rising stem design, which together perfectly resolve common issues in traditional gate valves, such as sticking and leakage in high-temperature or fluctuating temperature conditions. The stem position is clearly visible, providing intuitive visual indication of valve open/closed status. It is the ideal choice for applications requiring reliable shut-off and long service life in petroleum, chemical, power generation, and district heating systems.

• Self-Adaptive Sealing: The wedge disc features a split or flexible construction, allowing for slight deformation. Upon closing, it automatically compensates for clearance caused by thermal expansion, pipeline stress, or minor seat wear, ensuring tight bidirectional sealing.

• Anti-Sticking Design: The flexible construction prevents the risk of a rigid disc becoming "jammed" in the seats due to thermal expansion under high temperatures, guaranteeing smooth and consistent operation.

• Extended Seat Life: Reduces excessive seat wear caused by high wedging force, significantly prolonging valve service life and maintenance intervals.

• Visual Position Indicator: The stem threads are located outside the valve body (on the yoke). Operators can easily determine if the valve is fully open, fully closed, or in an intermediate position by observing the height of the rising stem, enhancing operational safety and convenience.

• Maintenance-Friendly: The packing box is located above the bonnet, allowing for easy inspection, adjustment, or replacement of the gland packing seal, even while the valve is in service under pressure, simplifying maintenance.

• Internal Thread Protection: The stem threads are isolated from the line media, preventing corrosion and contamination, ensuring long-term reliability of the actuating mechanism.

• Rigid Yoke Structure: A high-strength yoke provides stable support and guidance for the stem, ensuring steady operation even under high-pressure differentials.

• Versatile Material Selection: Key components like body, disc, and seats can be supplied in various materials (e.g., cast steel, stainless steel, alloy steel) based on media properties (corrosion, abrasion, temperature). Hard-facing with wear-resistant alloys is available.

• Standard Connections & Actuation: Available with standard end connections such as flanges (ANSI B16.5, GB, JIS, DIN, etc.) or butt-weld ends (ANSI B16.25). Can be fitted with handwheels, gear operators, or electric/pneumatic actuators to meet diverse operational requirements.

• Power Generation: Power plant boiler feedwater, main steam isolation, drain systems.

• Petrochemicals: Isolation of high-temperature oil, gas, and chemical process lines.

• District Heating: Main line isolation for high-temperature hot water and superheated steam networks.

• General Industry: Suitable for reliable isolation of various water, steam, oil, and gas pipelines where operating temperatures may fluctuate.

• Valve Type: Flexible Wedge Gate Valve, OS&Y Rising Stem

• Nominal Diameter: DN50 ~ DN600 (2" ~ 24")

• Pressure Class: PN16 ~ PN250 (Class 150 ~ Class 1500)

• Operating Temperature: -29°C ~ +425°C (Higher temperatures available upon request)

• Body Materials: WCB, WC6, WC9, CF8, CF8M, Other Specialty Alloys

• End Connections: Flanges per ANSI B16.5, GB, JIS, DIN, etc.; Butt-Weld per ANSI B16.25

• Packing: Flexible Graphite, PTFE (Selectable based on temperature)

• Actuation: Handwheel, Bevel Gear Operator, Electric Actuator, Pneumatic Actuator