Tips
High quality Needle Valve can operate manually or automatically. Manually operated needle valves use the handwheel to control the distance between the plunger and the valve seat. When the handwheel is turned in one direction, the plunger is lifted to open the valve and allow fluid to pass through. When the handwheel is turned in the other direction, the plunger moves closer to the seat to decrease the flow rate or close the valve.
Automated needle valves are connected to a hydraulic motor or an air actuator that automatically opens and closes the valve. The motor or actuator will adjust the plunger’s position according to timers or external performance data gathered when monitoring the machinery.
Both manually operated and automated Needle valves provide precise control of the flow rate. The handwheel is finely threaded, which means it takes multiple turns to adjust the position of the plunger. As a result, a needle valve can help you better regulate the flow rate of fluid in the system.
Needle Valve Features Material and Pictures
1. Needle valve
2. Made of Stainless steel ASTM A479-04(Grade 316)
3.Threaded ends according to ASME B 1.20.1(NPT)
4. Max.Working Pressure 6000 psi at 38 °C
5.Working Temperature -54 to 232°C
6.Safety bonnet lock prevents accidental lossening.
7.Back seating design protects the packing in fully open position.
| N° | Name | Material | Surface Treatment |
| 1 | Grib Scres Handle | SS316 | |
| 2 | Handle | SS316 | |
| 3 | Stem Shaft | SS316 | Nitrogen Treatment |
| 4 | Dust Cap | Plastic | |
| 5 | Packing nut | SS316 | |
| 6 | Lock Nut | SS316 | |
| 7 | Bonnet | SS316 | |
| 8 | Washer | SS316 | |
| 9 | Stem Packing | PTFE+Graphite | |
| 10 | Wahser | SS316 | |
| 11 | Lock Pin | SS316 | |
| 12 | O ring | FKM | |
| 13 | Body | Grade 316 |
Needle Valve Dimension Generals
| Ref | Size | PN(psi) | E | H | L | M | K | WEIGHT(Kg) |
| 225N 02 | 1/4" | 6000 | 25.5 | 90 | 61 | 55 | 4 | 0.365 |
| 225N 03 | 3/8" | 6000 | 25.5 | 90 | 61 | 55 | 4 | 0.355 |
| 225N 04 | 1/2" | 6000 | 28.5 | 92 | 68 | 55 | 5 | 0.440 |
| 225N 05 | 3/4" | 6000 | 38 | 98 | 76 | 55 | 6 | 0.800 |
| 225N 06 | 1" | 6000 | 44.5 | 108 | 85 | 55 | 8 | 1.120 |
Needle Valve Head Losses Diagram
Needle Valves Pressure Temperature Rating
Kv VALUES
KV=Flow rate of water in cubic meter per hour(m³/h) that will generate a pressure drop of 1 bar across the valve.
| size | 1/4" | 3/8" | 1/2" | 3/4" | 1" |
| m³/h | 0.3 | 0.3 | 0.63 | 0.73 | 1.4 |