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The Parker 338 Series Needle Valve is a bi-directionally metered valve that provides efficient and precise flow control and adjustment even at low flow rates. The plunger in these valves is a fine taper needle which provides precise flow control even at low flow rates. The perimeter of the adjustment knob features numerical micrometer position markings, providing a visual indication of the flow controls settings. Once the desired flow is selected, a set screw can be tightened to maintain the settings. Extended Temperature versions up to 300 degrees F are available as specials.
Markets:
• Factory Automation
• Heavy Industries
Features/Benefits:
• Precise Low-Flow Control
• Heavy duty brass construction
• Micrometer visual set points
Applications:
• General purpose industrial pneumatics
• Industrial equipment requiring motion of work to stop slowly at the end of operation
| Media | Air |
|---|---|
| Division | Pneumatic Division |
| Product Type | Needle Control Valve |
| Body Material | Brass |
| Seal Material | Urethane, Nitrile Butadiene Rubber (NBR) |
| Flow Rate | 32 to 327 SCFM (free flow), 15 to 140 SCFM (metered) |
| Mounting Type | Inline |
| Operation Type | Knob with Micrometer Position |
| Operating Temperature | 0° to +180° °F, -18° to +82° °C |
| Port Size | 1/2 inch |
| Port Type | NPT |
| Port Size (inch) | 1/2 |
| Port Connection | NPT |
| Operating Pressure | 0 to 250 psig, 0 to 17 bar |
| Flow Coefficient | 0.28 to 2.62 Cv (metered), 0.60 to 6.13 Cv (free flow) |
| Needle Material | Stainless Steel |
| Lubricant | None |
