Pressure Regulators Mark 518 Series Low Pressure Back Pressure Regulators The Mark 518 is a back pressure regulator for use in low pressure air and gas services. With a selection of six pressure ranges, set points can be chosen to control back pressures from 1" w.c. to 7 psi (3mbar to 9,5 bar). As a standard feature, the Mark 518 is provided with soft seats for ANSI Class VI bubble-tight shutoff. The valve is also leak-proof under vacuum conditions. Application The MK518 back pressure relief valve is used for maintaining the pressure of air and gases in the positive inches w.c. (mbar) pressure range. The regulator is specifically designed for pressure inertizing and blanketing in mixing vessels, storage tanks and containers using an inert gas such as nitrogen. For regulating back pressure under vacuum or for use as a vacuum breaker, special configurations of the Mark 518 are available. Additionally, an air assisted version os available for higher setpoints to aid tank pressurization during emptying with a relief function. Features • Completely self-operated –spring-loaded regulator operates off of process pressure and requires no external power source or air supply for operation. • Wide range of low pressure back pressure settings – choose from six pressure ranges for set points ranging from 1" w.c. to 200" w.c. (2 mbar to 520 mbar). • Long service life – all wetted metal parts produced from Stainless Steel or Hastelloy C for durability and long life. • Tighter shutoff – soft seats for ANSI Class VI bubble-tight shutoff. Jordan Valve a division of Richards Industries 3170 Wasson Road • Cincinnati, OH 45209 513.533.5600 • 800.543.7311 • 513.871.0105 (f) [email protected] • www.jordanvalve.com Mark 518 Low Pressure Back Pressure Regulators The spring in the Mark 518 holds the seat in the normally closed position, As the inlet pressure increases to the set point (as determined by the value set via the adjusting screw), the diaphragm is pushed upward to overcome the force of the spring. When the pressure rises above the set point, the valve will begin opening to relieve the pressure. The pressure set point can be changed by turning the adjusting screw clockwise or counter-clockwise to achieve the desired setting.

Mark 518 Low Pressure Back Pressure Regulators Specifications Temperature: -14°F to 356°F (-10°C to 180°); PTFE/Viton Sizes: 1" (DN25), 2" (DN50), 4" (DN100) End Connections • ANSI (150) • DIN (PN16) • NPT (1"/DN25 size only) Materials: • Body: 316 Stainless Steel • Trim: 316 Stainless Steel or Hastelloy C • Spring Housing: Steel • Diaphragm: PTFE or Viton • Valve Seat: J-6000 Black (with PTFE diaphragm) or Viton (with Viton diaphragm) Service: Low pressure air or gas Shutoff: ANSI Class VI Ranges: 1" (DN25) range • 1 to 5 inches w.c. (2 to 12 mbar) • 1 to 9 inches w.c. (3 to 22 mbar) • 8 to...

Mark 518 Low Pressure Back Pressure Regulators Flow Charts • 1", Cv = 7.5 (6,5 Kv) P1 Inches W.C. (mbar) Consult factory for 4" information -3-

Mark 518 Low Pressure Back Pressure Regulators Model Standard Material Stainless Steel Hastelloy C Connections Flange Threaded (1"/DN25 only) Connections #2 DIN (BSPP for threaded) ANSI FNPT for threaded Non-Standard Diaphragm PTFE Viton Pressure Range (1") W.C. mbars 1 to 5 inches w.c. 2 to 12 mbar 1 to 9 inches w.c. 3 to 22 mbar 8 to 24 inches w.c. 20 to 60 mbar 4 to 40 inches w.c. 10 to 100 mbar 8 to 88 inches w.c. 20 to 220 mbar 8 to 209 inches w.c. 20 to 520 mbar Pressure Range (2") W.C. mbars 1 to 4 inches w.c. 2 to 10 mbar 2 to 8 inches w.c. 5 to 20 mbar 3 to 20 inches w.c. 8 to 50 mbar...