Gestra disc check valve RK 86a

Gestra disc check valve RK 86a

‌Product Overview‌

• ‌product nameDISCO Check Valve RK Series (RK 86/RK 86 A)

• ‌Product positioningDurable and sturdy multi-faceted check valve.

• ‌design standardsThe overall length is short and complies with DIN EN 558-1 standard (equivalent to DIN 3202 series K4).

• ‌Nominal pressurePN 6 to PN 40.

‌Applications and Features‌

• ‌Scope of applicationSuitable for liquids, gases, and vapors. Especially suitable for industrial applications, including low-temperature environments, corrosive fluids, and boiler feedwater pipelines.

• ‌Core Features‌：

• The designed fixed centering lug facilitates the optimal guidance of the flange towards the valve disc.

• Standard equipped with grounding connection.

• Wide sealing surface.

• The RK 86A model has been certified by Bureau Veritas.

‌Model and Specifications‌

• ‌modelRK 86 and RK 86A.

• ‌Nominal diameter (DN): 15 mm to 200 mm (1/2 inch to 8 inches).

• ‌pressure rating‌： PN 40 / Class 300。

• ‌Valve body material‌：

• ‌RK 86The valve body of DN 15-100 is made of chrome steel (1.4317), and the valve disc is 1.4571; The valve body of DN 125-200 is GP240GH (1.0619), and the valve disc is 1.4006.

• ‌RK 86AThe valve body of DN 15-100 is 1.4408, and the valve disc is 1.4571; The valve body of DN 125-200 is 1.4408, and the valve disc is 1.4404.

• The document specifies the corresponding ASTM equivalent materials and reminds attention to the differences in physical and chemical properties.

‌Key dimensions and weight‌

• ‌Length (L)As DN increases, it increases from 16mm for DN15 to 140mm for DN200.

• ‌Flange center distance (Z min./Z max.)Provides the minimum and maximum center distances for DN15 to DN100.

• ‌Outer diameter of flange (D)For DN125 and above specifications, flange outer diameters are provided for different pressure levels (PN10/16, PN25, PN40, Class 125/150, Class 300).

• ‌weightFrom 0.27kg for DN15 to 25kg for DN200.

‌Pressure/temperature rating (metal to metal valve seat)‌

• ‌RK 8651.1 bar is allowed at -10 ° C, 43.8 bar at 200 ° C, and 37.6 bar at 350 ° C.

• ‌RK 86AAllow 49.6 bar at -200 ° C, 35.7 bar at 200 ° C, and 24.9 bar at 550 ° C.

• ‌Important NoticeIf the working temperature exceeds 300 ° C, intergranular corrosion may occur. Unless intergranular corrosion can be ruled out, the operating temperature of the equipment should not exceed 300 ° C.

‌Design and Configuration Options‌

• ‌Valve seat type‌：

• ‌standardMetal to metal valve seat.

• ‌optionalEPDM, FPM, PTFE soft valve seats (different models and sizes have different temperature ranges).

• ‌Spring configuration‌：

• ‌standard: No spring.

• ‌optionalStandard springs, special springs, and nickel chromium iron alloy springs (suitable for high temperatures above 300 ° C).

• ‌otherStandard equipped with grounding connection.

‌performance parameters‌

• ‌Opening pressureListed are the opening pressure values (in mbar) for DN15 to DN200 in configurations without springs, with standard springs, and different flow directions (vertical upward/horizontal).

• ‌Pressure drop curveThe chart shows the relationship between pressure drop and volumetric flow rate of different DN valves in water (20 ° C). For other fluids, the equivalent water flow rate needs to be calculated before checking the graph.

• ‌Minimum flow requirementThe chart indicates the minimum volume flow required for springless valves in vertical upward pipelines and for standard spring-loaded valves in horizontal flow.

Gestra disc check valve RK 86a