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MID-WEST Instrument – Accessories

Pulsation Dampeners, Pressure Limiting Valves (“Gauge Minders”), and Manifold Valves (Manifolds)

The Model 150 Pulsation Dampener

The Model 150 “Vari-Damp®” all purpose pulsation dampener features both a fine thread needle valve for adjusting dampening characteristics

and a Precision Controlled Flow Rate Ball Check to block line surges, shock waves, or fluid hammer. This adjustment can be performed with the unit pressurized.

The Model 150 provides outstanding protection for applications where low displacement devices such as bourdon tube gauges or electronic transmitters are used or in high displacement devices where diaphragm, piston, or bellows operated gauges, recorders, or controllers are required. Double-ported instruments, like Differential Pressure Gauges, should be installed with a Model 150 on each input pressure line.

Product Features:

  • Controlled Leak Check for Protection against Pressure Spikes
  • Fine Control Needle Valve for Adjustable Pressure Pulsation Dampening
  • 5000 (340 bar) or 10000 (680 bar) PSIG Working Pressure
The Model 200 Pressure Limiting Valve
200 B
200 Br

The Model 200 “Gauge Minder” features a pressure limiting valve that blocks off excess pressure to the instrument, preventing calibration failure, internal damage, and “blowout” from over-ranging – a principal cause of instrument failure.

The Model 200 is supplied with a set of (3) range springs designed to set the shutoff pressure point at any pressure from 50 PSI (3.4 bar) to 5000 PSI (340 bar). The automatic shutoff valve is positive on closing and is non-chattering. Once closed, pressure need only be reduced approximately 10% of set pressure to re-open the valve. No external reset is required. The accuracy of the instrument used with the Model 200 is in no way affected up to the set point of the pressure shutoff.

Product Features:

Protection of Pressure Gauges and Transmitters Components from Over Pressure

  • Pressure rating: 6000 PSIG (414 bar) @ 240°F (115°C).
  • Instrument Connections: Std. 3 & 5 Valve = ½” FNPT / 3-Valve Mini-Manifold:= ¼” FNPT.
  • Process Connections: Std. 3 & 5 Valve = ½” FNPT / 3-Valve Mini-Manifold:= ¼” FNPT.
  • Dust Cap: Protects spindle threads from dirt and dust.
  • Gland Nut and Lock Nut: Adjusts the packing compression to provide leak free operation even on vacuum service.
  • Gland Packing: PTFE packing and metal seal ring ensures leak free operation.
  • Bonnet: Precisely machined bonnet adds a high level of reliability at maximum pressure & temperature while increasing valve life and protecting stem threads from atmospheric corrosion.
  • Isolated Stem Threads: Adjustable packing below stem ensures leak proof long service life.
  • Less Parts: Less leak points and less fugitive emissions.
  • Test Ports: ¼” FNPT ports which may be used as test connections (#107470 & #107469). (#113343 Mini-Manifold does not have test ports.)
  • Teflon Packing, Integral (Body Material) Seat and Stainless Steel Body.

Product Features:

3 & 5 valve manifolds are designed for applications where direct mounting to an instrument is impractical or undesirable. The manifold is mounted to the lines from the instrument and signal rather than directly to instrument. Bubble tight shut-off, lightweight, super strong construction, compact designs that require less parts, chrome plated stems that prevent galling and stripping- these valves are built to perform under pressure. That’s why in some of the most rigid tests, manifolds provided by Mid-West Instrument consistently meet or exceed industry standards.