The GV210R-20B07 is a 2-way globe valve from the VG210R series, sized DN20 with Rp internal threads and a bronze body rated PN16. It's built for modulating control of water or water-glycol mixtures up to 60 % concentration in HVAC or process loops — the equal-percentage flow characteristic (6.49 kvs) gives stable gain across the stroke, which matters when the loop controller expects a linear response from the valve and the actuator stroke is 11 mm.
Seat leakage is Class IV (0.01 % of rated flow) — that's a metal-to-EPDM seal that holds tight at shutoff without relying on a soft seat insert, so it's suitable for applications where dribble past the seat would upset the process or waste energy. The 316 stainless steel plug and trim resist corrosion in closed loops with treated water or glycol, and the brass packing (UNS C36000) handles the stem seal without galling over the rated temperature range of -7 to 100 °C. Rangeability greater than 50:1 means the valve can throttle down to about 2 % of full flow while still maintaining control — that's useful in variable-load systems where the valve must handle both design flow and low-load turndown without hunting or losing resolution.