Gestra Flowserve RK 86
Disc-type check valve for mounting between flanges, in chromium steel or stainless steel.
RK 86 is the Gestra series of disc-type (wafer) check valves, clamped between flanges, available in sizes from DN 15 to DN 200 (DN20 being one of them) and in pressure ratings PN 10/16/25/40 or ASME 125/150/300. The RK 86 version has a chromium steel body (up to DN 100) or a cast steel body (DN 125–200), while the RK 86A version, in stainless steel across the whole range, covers temperatures up to 550°C; the self-centring body with patented lugs simplifies installation.
For a quotation on an RK 86 check valve we need the nominal diameter, the pressure rating, the seat material (metal, EPDM, FPM or PTFE) and the fluid carried in the pipeline. RK 86 check valves are supplied to order from the European Union, with a lead time of 1–4 weeks, with no stock or price information.
Models and codes
| Code | Note |
|---|---|
| RK 86 | chromium steel or cast steel body, DN 15–200 |
| RK 86A | stainless steel body across the whole range, temperature up to 550°C |
| RKE 86 | variant of the RK 86 series, DN 15–200 |
| RKE 86A | stainless steel variant of the RK 86A series |
Key specifications
| Diameter range | 15–200 DN |
|---|---|
| Pressure rating | 10/16/25/40 PN |
| Temperature, RK 86 | -10…400 °C |
| Temperature, RK 86A | -200…550 °C |
| Seat material | metal / EPDM / FPM / PTFE |
The manufacturer's datasheet and product documentation for RK 86/RK 86A are current, with no withdrawal notice.
Frequently asked questions
What information do we send for a quotation on an RK 86 check valve?
The nominal diameter (DN), the pressure rating (PN or ASME), the required seat material and the type of fluid carried in the pipeline. For high temperatures we also specify whether the stainless steel RK 86A version is needed.
What do we check before quoting for the GESTRA series?
We do not confirm from our own sources the exact compatibility with an older flange already on the installation; we check the dimensions in the manufacturer's current datasheet before quoting. We make no promise of delivery from stock.
We do not fit the check valve on the customer's installation; we supply the product with the manufacturer's certificates and datasheet.
Updated: 2026-11-12