Piloted, Critical Pressure Reducing Applications

The Mark 687 Series is a piloted soft seat regulator for critical pressure reducing applications. It uses balance plug trim with the action of a pilot valve to create a faster, more accurate (meaning less droop as your flows increase) response.

Features & Benefits
  • Easy to maintain and service — remove bottom entry to access plug. Diaphragm is accessible from the top.
  • Large effective diaphragm area — for increased accuracy and sensitivity.
  • Large orifices and body passages — provides high flow capacities.
  • Tight shutoff — ANSI Class VI
  • For applications with differential pressures up to 150 psi (10 bar) — on water, air, oil, gas and chemicals
Specifications

Sizes: 1-1/2″ – 2″ (dn40 – dn50)

Cv (Kv): 1-1/2″ 40 (34); 2″: 50 (43)

Seat: 316SS/PTFE

Body Material: Carbon Steel (ASME SA216 WCB) & Stainless Steel (ASME SA351 CF8M)

End Connection: Threaded & Flanged (ANSI 150#, 300# and DIN PN10/16, PN25/40)

Min & Max Pressure Drop: 25 psi minimum (1,7 bar); 150 psi maximum (10,3 bar)

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