Tilting disc check valves


100 – 2.000
10 – 25

Double eccentric flanged non-return valves with epoxy coating in long or short overall length in welded steel design with flow-optimised free-swinging disc. For use in water and steam applications.

Working pressure: max. 25 bar
Working temperature: -50°C bis +200°C
Seat-geometric: Double eccentric
Shaft bearing: Self-lubricating
Inner seal: soft sealing
Outer seal: double shaft bearing by means of o-rings
for dynamic/static sealing


Rückschlagklappe RTRK
Application overview, types of actuation, valve types
Branch of industry RTRK  
Actuation RTRK
Manual control 1
Electrical drive 1, 2
Pneumatic drive 1, 2, 3
Hydraulic drive 1, 2, 3
Drop weight drive 1, 4
Lever & weight  
Oil brake  

1) Open - Close, 2) Controlled, 3) Quick opend - closed, 4) Closed by gravity 5) Forced controlled, 6) Damped

Valve type  
RTRK Tilting disc check valve “soft seated” double excentric, p max. 25 bar, -58° F to 392° F, DN 100-2000, PN 2,5/6/10/16/25 bar, ANSI 150/300, Material: Carbon steel / SS
Power plant
- Cooling water
- Air condenser
- Heating water
- Steam turbine
- Steam circuit

Water, Sea water  
Water dam  
District heating
Steam generation
Pump station  
Gas, Natgas
Mineral oil  
On-shore, Off-shore  
Garbage incineration  
Mining industry
Mechanical engineering
Sugar industry  
Paper industry  

• Recommended application

Product features and benefits

• throttle control function with low torque
• face-to-face dimensions to en 558-1, basic series 14 (din 3202, f4)
• with flange connection on both sides to en 1092 / ansi b16.5 and b16.47
• centric or double eccentric disc
• punch-through or stop
• double eccentric version with high differential pressure
• throttling in closing position with stop-on version 0.4% of the kvs value and with punch-through version 0.6%
• version with maintenance-free double O-ring seal or low-friction packing ring version at temperatures >200° C

Material, corrosion protection, versions


• Body: P265GH (1.0425); P355NL1 (1.0566); 16Mo3 (1.5415); SA516 Gr.60/70; 13CrMo4-5 (1.7335); 21CrMoV5-7 (1.7709); X5CrNi18-10 (1.4301); X6CrNiMoTi17-12-2 (1.4571)
• Valve disc: P265GH (1.0425); P355NL1 (1.0566); 16Mo3 (1.5415); SA516 Gr.60/70; 13CrMo4-5 (1.7335); 21CrMoV5-7 (1.7709); X5CrNi18-10 (1.4301); X6CrNiMoTi17-12-2 (1.4571)
• Outer Seal: pure graphite or with double o-ring sealing
• Shut-off valve shaft: Edelstahl 1.4021/ 1.4122
• Body seat: Hochlegierte Auftragsschweißung oder aus verschleißfestem, nichtrostendem Stahl, feinstbearbeitet Andere Materialien auf Anfrage

Corrosion protection

• Body: Inside and outside epoxy coating according to GSK guidelines possible
• Valve disc: Epoxy coating according to GSK guidelines possible (Exceptions: DN100-125, valve disc made of stainless steel)


• with electric drive
• with handwheel
• with pneumatic drive
• with hydraulic drive
• enamelled or with special coatings on request
• suitable for gas according to EN 13774