| Standars | Sizes |
|---|---|
| ANSI B16.34 API 6D BS 1868 | 1/2”-72” 150# 1/2”-64” 300# 1/2”-56” 600# 1/2”-48” 900# 1/2”-36” 1500# 1/2”-30” 2500# 1/2”-24” 4500# |
| API 6A | 2-1/16”- 11” 2000 psi 2-1/16”- 11” 3000 psi 2-1/16”- 11” 5000 psi 1-13/16”- 7 1/16” 10000 psi 1-13/16”- 4 1/16” 15000 psi 1-13/16”- 3-1/16” 20000 psi |
Check Valve
supplying and distributing of Valves, Pipes, Fittings, Hydraulic Clamps, Hydro-line products and oil, Gas, Petrochemical field supplies
Check Valves Features
supplied any of the materials mentioned above to fulfill any additional requirement included in customer specifications
Materials:
Notash company supplied check valves with all material types to fulfill all the different combinations of service fluid, design pressure and temperature. Valves can be supplied either forged or casted based on customer specifications. Following materials are under the scope of supply of Notash:
- Carbon Steel valves
- Low temperature carbon steel
- High temperature alloy steel
- Stainless Steel Valves
- Super Austenitic Stainless Steel
- Duplex Stainless Steel
- Super Duplex Stainless Steel
- Ni Alloy
- Titanium
- Aluminum bronze
Types:
- Swing check / Dual plate / Tilting Disc / Piston check / Ball check / Single
- Disc / Axial check
Construction:
- Bolted bonnet / Pressure seal
- Wafer / Lug / Double flanged
Optional features:
- Position indicator
- Locking devic
- Emergency assisted valves
- Dumpered valves
Globe Valves Configurations
Dual Plate Check Valves
Valves provided with double disc and spring. They are available with metal to metal seats and soft seats. This design reduces substantially the weight of the valve as well as the face to face dimension.
Testable Check Valves
In those cases when indication of check valve position is required the valve is provided with a position indicator and limit switches. Also a operating lever is available in case proper rotation of hinge shaft must be checked.
Piston Check Valves
Normally upto sizes 2”, (larger sizes are also available) both T-Pattern and Y-Pattern are available.
Emergency Assisted Check Valves
Used in the turbine steam extractions of power plants. Valve is provided with a pneumatic piston and solenoid valve in such a way that when a closing signal is received in the solenoid valve the air in the pneumatic piston is released starting the closing stroke of valve disc and ensuring fast valve closing by fluid-media.
Swing Check Valves
Valve disc is provided with antirota-tions pin. Full opening swing check valves to API 6D or API 6A suitable for pig passage are also available.
Tilting Disc Check Valves
When the check valve must be operated by a very small pressure drop this design is used. Valve disc is balanced in such a way that very small variations of pressure open/close the valve. This reduces substantially the pressure drop across the valve.
Special Globe Valves
Control Valves
RV offers a wide range of control valves for the most severe appli-cations.
In those cases when valve is intended for control or throttling service, cage guided design is required. There are different types of cages and trims designed to provide different valve characteristics and Cv-values.
Stop Check Valves
This design is a combination between globe valve and check valve. When valve is open, the stem is in open position the valve operates like a piston check valve, disc is moved by the fluid-media. However when valve has to be closed the stem goes down againts the disc ensuring dhut-off of the valve.
Choke Valves
For API 6A applications choke valves, both positive and adjustable are available. Choke valves are specifically design for service conditions providing different types of beans for positive chokes (including ceramic materials, tungstem carbide and hardened mar-tensitic steels) as well as different configurations of seats, cages and discs for adjustable chokes.
Bellows-Sealed Valves (Zero Stem Leakage)
For those applications when emissions to the atmosphere are strictly forbidden, valve is provided with metallic bellows which ensures no leakage through the stem packing to the atmosphere.