Description
TECHNICAL DETAILS
• Body: DN 100-300 and DN 350-1200/PN 25: ductile cast iron EN-JS1050,
DN 350-1200/PN 10-16: grey cast iron EN-JL1040
• Piston guide: on strips, DN 100-150: stainless steel; DN 200-300: special
bronze, highly wear resistant; DN 350-1200 and DN 200-300/PN 40: special
brass
• Vaned ring: bronze
• Seat ring, slotted cylinder and perforated cylinder: stainless steel
• Gaskets / seals: elastomer, KTW and W270 approval
• Piston, shaft, slider crank, push rod, bolt: stainless steel
• Gearbox body: grey cast iron EN-JL1040
• Gearbox crank: ductile cast iron EN-JS1050
• Gearbox stem: ferritic Cr-Ni steel
• Stem nut: special brass
• Gearbox configuration: in flow direction “right”; “left” or other arrangements are also possible
• Corrosion protection of the body parts: ERHARD EKB fusion bonded epoxy, colour “blue”, coat thickness > 250 μm. Further coating options possible, we would be pleased to advise you
PRODUCT DETAILS
Product Features:
1. Standard ERHARD RKV needle valves are designed for installation in horizontal or vertical pipes, whereby it is important to ensure that the valve is installed in the pipe according to the flow arrow cast onto the pipe.
2. Nominal size reduction is possible, as ERHARD RKV needle valves are designed according to the flow velocity. We recommend achieving the transition to the pipe nominal size with abrupt extension flanges, which we can supply with the valve if required.
3. To ensure perfect operation, for velocities above 1.5 m/s we recommend a straight pipe section of at least 3-5 x DN upstream and 5-10 x DN downstream of the valve, within which there must be no fittings or valves.
4. If using an adapter or extension section, wherever possible, we recommend installing it in the pipe upstream of the ERHARD RKV needle valve.
5. Needle valves may not be used as the pipe support. The feet cast onto the housings are solely for supporting the valve and not as a pipe fixing point. On request, ERHARD RKV needle valves are supplied with baseplates mounted
on the underside.
6. If using ERHARD needle valves in the bottom outlet, an appropriately dimensioned venting device must be installed downstream of the valve, which ERHARD can also supply on request, if the valve does not pump directly into the open air.
7. If on the other hand the valve pumps directly into the open air, a venting device is not necessary. In this case the valve is equipped with an outlet flange only.
8. Inline fixed throttling cylinder can be used for additional pressure reduction for installation in pipes.
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