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3-Valve Manifold
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Typical Installations
MM4U Typical Installations
  • 2-1/8" to 2-3/16" center to center all flanged connections. Line side provides threaded connections for mounting standard oval flanges furnished with the transmitter or D/A's investment cast adapter flanges
  • A pair of purge or bleed valve connections at both top and bottom for versatility and convenience
  • Straight-through roddable porting - no stagnant cavities
  • In-line replaceable soft seats and seals
  • PVC coated directional arrowhead handles with positive stops
  • Bonnetless construction with unique tapered plug design
  • Barstock construction
  • No metal to metal contact
  • Adjustable packing nut stops interport and stem leakage
  • Optional integral steam heating system

The D/A MM4U is a universal mounting 3-valve manifold providing the 3 required functions by simply dialing NORMAL, ZERO or BLOCKED. This same unique manifold excels in the ability to perform as both a manifold and a sturdy transmitter mount for either remote mounted or meter run flange mounted systems. It serves well in liquid or vapor service, and in both systems, offers easy 360 degree access to the 4 transmitter mounting bolts.

The Unimount design allows the completion of all piping prior to installation of the transmitter. The built in manifold mounting system permits easy removal of the transmitter without disturbing the process lines or mounting connections.

The D/A UNIMOUNT - World's Most Universal Mounting Manifold

Normal Mode
MM4U Normal Mode

Zeroing Mode
MM4U Zeroing Mode

Isolation Mode
MM4U Isolation Mode

Note: Because of the unique fool-proof design, the Zeroing Valve and Blocking Valve handles can be dialed to their respective positions in any order without causing improper operation.
Normal Mode
With both valve handles in the normal position, the MM4U is in the normal mode with both process inlets open and the equalizing port blocked.
Zeroing Mode
By dialing the Zeroing Valve handle to the ZERO position, the MM4U is automatically switched to the zeroing mode which completely and properly prepares the transmitter for zeroing by (1)first blocking one inlet impulse line and (2) then opening the equalizing port which bypasses the blocked inlet to equalize the P cell at process pressure. Because it basically operates like a 3-way valve, this forced zeroing sequence provides fool-proof operation and safety. After correcting for zero offset, the transmitter is returned to service by simply redialing the handle to the NORMAL position which, again, correctly sequences back to the service mode by closing the equalizer first and then reopening the blocked inlet.
Isolation Mode
By dialing the Zeroing Valve and Blocking Valve handles to the ZERO and BLOCKED positions respectively, the MM4U is automatically switched to the islolation mode where both inlets are blocked and the equalizing port is closed. The transmitter is now safely isolated and prepared for field servicing, recalibration or removal. The transmitter is returned to service by simply redialing the handles to their NORMAL positions which, again, correctly sequences back to the service mode by leaving the equalizer blocked and reopening both inlets.
Max Ratings:
  6000psi @ -150ºF to 150ºF
  3500psi @ 220ºF
  6000psi @ 325ºF
  2500psi @ 520ºF
 Flanged instrument x Flanged process
Design Codes:

ANSI B31.1, B16.5, NACE MR-01-75(special order)
Material Codes:
Barstock, A479 - 316, A276-316;
Cast, ASTM-A743 CF3M, ASTM-A-351 CF3M, A 276-316.
Materials of Construction:
 Body: 316SS or nickel plated C.S.
 Wetted Plug: 316SS
 Plug Liner: Teflon or Ryton reinforced Teflon
 Face Seals: Ryton reinforced Teflon
 Non-Wetted Trim: 303SS
 Handle: Cast aluminum arrowhead - PVC coated
 Nameplate: SS embossed
 Plugs / Bleed Valve:316SS

Exotic materials: Hastelloy C, Monel, Alloy 20, etc. consult factory.
All units are supplied with 4 transmitter mounting bolts, 2 face seals and 2 U-bolts.
Assurance of Satisfaction: When properly installed, D/A guarantees the MM4U to be free from defective workmanship and material under normal use and service for a period of one year from date of shipment.

Code  Dial-A-Function, Unimount 3-valve manifold
MM4U  Flanged (instrument) x Flanged (process)
| Code   Plug Liner
| T  Teflon
| R  Ryton reinforced Teflon
| | Code  Body
| | S  Stainless Steel, 316
| | C  Nickel Plated C.S.
| | | Code  Wetted Plug
| | | S  Stainless Steel, 316
| | | | Code  Options
| | | | ALH  Arrowhead Locking Handles
| | | | LH  Lever Handles
| | | | SP  1/4" Purge Port, side, plugged
| | | | IP  Interlock Protection
| | | | RO  Rod-Out connections
| | | | SH  Integral Steam Heating System
| | | | MRML  **Meter Run Mounting Kit for liquid service
| | | | MRMV  **Meter Run Mounting Kit for vapor service
| | | | |  
Model Number

**Note: If primary block valves will be installed at the meter run flanges, add a "B" to the options (MRMLB or MRMVB) and a longer support bracket will be included.


D/A Manufacturing Co., Inc.
Hwy 86 East or P.O. Box T
Tulia, TX  79088-0920 USA
Phone: (806)995-2316
FAX: (806)995-4601