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| FEATURES |
| Wallace & Tiernan Products Purge Meters are low-flow variable area meters which incorporate several improvements in basic design. They feature an unusually rigid, corrosion resistant stainless steel frame and a positive, easily controlled tube lock. Low Flow Meters are specifically designed for low flow applications in research and industry. For higher capacities, write for TI 520.100 describing the Glass Tube Varea-Meter. For high temperature, high pressure, or hazardous fluid metering, write for publication TI 520.205 on the Metal-tube Varea-Meter ® or 520.215 on the TFE-lined and PVC-tube Varea-Meters ® . |
| STRUCTURALLY STRONG FRAME |
| The side frames are heavy, channel-form stainless. steel sections welded to stainless end fittings turned from bar stock. This produces a rigid unit which resists pipe strains and protects tube alignment. |
| CHOICE OF CORROSION-RESISTANT MATERIALS |
| The frame is made of 302 stainless steel; the end fittings, 316 stainless. The metering-tube retainer is Kynar vinylidene fluoride resin with 316 stainless optional. O-rings come in a choice of Buna N or Viton with EPR (ethylene propylene rubber) optional. Valve trim (seat and stem) is 316 stainless. |
| POSITIVE TUBE LOCK AND A TUBE SHIELD |
| A knurled tube-locking nut, external to the flow, positions the tube retainer and locks the tube firmly in place. Tube removal is quick and easy. O-rings seal the tube at both ends. A clear plastic shield covers the tube. It has tabs which snap into slots in the frame. |
| VERSATILE FLOW CONTROLLER |
| A W&T Flow Controller keeps flow constant regardless of pressure variations. It comes in brass or 316 stainless steel, in inlet or outlet configurations and high or low capacities. Replaceable seat adapters make for easy capacity changes. Straight-through design means the controller can be threaded directly into the meter body, eliminating pipe nipples and static piping. |
| INTEGRAL BACKCHECK |
| An anti-backflow device is built into the discharge. It consists of a 316 stainless steel poppet with a Buna N or Viton O-ring seal. This allows easy maintenance on tube and float. |
| HIGH INTERCHANGEABILITY |
| All parts, except tubes, frames, and plastic shields, are interchangeable regardless of scale length. Tubes have same size O-rings at each end. The tubes for all capacities fit one frame size. This and the one-piece frame make for design simplicity with simplified maintenance and spare parts stocking. |
| CHOICE OF ARRANGEMENTS AND OPERATING POSITION |
| Low Flow Meters can be supplied with: an integral flow control valve with a screwdriver-slot stem or a knob for adjustment; a factory-connected flow controller to maintain flows constant; and a plastic bezel for flush panel mounting. The meter can be inverted and its tube reversed to change the control valve from the inlet to the discharge. |
| VERSATILE CONTROL VALVE |
| The optional control valve has a common stem with high- or low-capacity seats; all are 316 stainless. An O-ring in the seat makes it easy to change. The valve gives smooth adjustment and a fine degree of control. |
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