Danfoss AB-QM ANSI 1¼" — high-flow pressure-independent balancing and control valve (PICV) with external NPT thread for North-American terminal-unit piping. A built-in differential-pressure controller keeps the flow through the settable orifice constant regardless of pressure fluctuations elsewhere in the network, so each terminal delivers its design flow without manual re-balancing; the presetting dial fixes the maximum flow and the valve also acts as a shut-off. CW 617N body, External thread NPT connection, maximum flow 17.5 gal/min, control differential pressure 5 psi to 60 psi, static pressure to 300 psi, media temperature 15 °F to 250 °F. Supplied without test plugs. Actuator connection M30 x 1.5. OEM P/N 003Z1335. EAN 5710104061566. Technical data quoted verbatim from store.danfoss.com (code 003Z1335).