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
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.
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.
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.
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.
6000psi @ -150ºF to 150ºF
3500psi @ 220ºF
6000psi @ 325ºF
2500psi @ 520ºF
Flanged instrument x Flanged process
ANSI B31.1, B16.5, NACE MR-01-75(special order)
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
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.