Edwards Needle Gas Valve
The Edwards LV10K manual fine control needle valve provides close control of a gas bleed or gas injection into a vacuum chamber. It can be mounted in a pipe-run or on a panel. A knob controls needle movement and, therefore, the gas leak rate through the valve. Resetting flow rates is aided by a pointer moving over a 100 division scale . (The scale can be rotated relative to the valve body as needed.)
The stainless steel needle is spring-seated in a replaceable brass valve seat. The constant spring pressure reduces the risk of needle damage. A fluoroelastomer 'O' ring provides the seal between the needle and the valve-body. Each valve port is fitted with sintered bronze filter to prevents particulate matter entering the valve and damaging the needle or seat.
Specifications
| Component | Construction Materials |
| Model | LV10K |
| Body | HE30 aluminum |
| Seat | Brass BS2784 C2112 |
| Seal | n/a |
| Needle | Martensitic SS EN56AM |
| Filter | Brass BS249 |
| Max. flow rate (L/sec.) |
0.1 (@1 bar diff.) |
| Max. inlet pressure (psi) |
30.5 |
| Max. leak rate, across body (TL/sec.) |
10-7 |
| Max. leak rate, across seat (TL/sec.) |
10-7 |
| Vacuum connection | QF10 |
| Weight (oz.) | 4.87 |