Back Pressure Regulators Mark 50 Series Self-Operated Back Pressure Regulators The Mark 50 Sliding Gate Back Pressure Regulator is used to regulate upstream pressure at a predetermined setpoint. The spring in the Mark 50 holds the sliding gate seats in their normally closed position. This brochure includes the following Series: • • MK50: a line of self-operating back pressure regulators designed with Jordan Valve’s sliding gate seats. MK51: The MK51 features a larger diaphragm than a standard MK50 to provide even greater sensitivity and more accurate regulation of your required setpoint. MK50QC: The MK50QC features a “Quick Change” dome for simple range spring replacements. Ideal for facilities with multiple back pressure requirements as it is possible to stock one valve with several spare springs to cover a wide range of needs. MK50H: The MK50H features a handwheel that is mounted on the adjusting screw to allow easy setpoint changes. MK50HP: The MK50HP option is an elongated spring housing that features a large spring for high pressure setpoints up to 450 psi (31,03 bar). MK50GP: The MK50GP option is used in grain processing for starch cookers and other viscous services. MK50CR: The MK50CR option has a special spring housing for use if the valve is in cryogenic services. MK501/502: The MK501 and MK502 meet higher capacity requirements than standard back pressure regulators. Sliding Gate Trim — unique seat design for unsurpassed trim life and accuracy. Jorcote Seat Coating — ceramic composite for liquids, gases and especially steam. Very low friction with outstanding wear resistance and a temperature rating of up to 550°F (288°C). Steam tested to 1,000,000 cycles and still maintained Class IV leakage. Jorlon Diaphragm — extremely durable, virtually universally applicable up to 450°F. Tested without failure to over 1,000,000 full stroke cycles. Ideal for steam, gases and liquids. 316SST diaphragm applicable up to 650°F. Straight-through Flow — The flow is straight through the valve seats and body. Direction of the disc travel is perpendicular to the flow, not opposed to the direction of the flow. Thus, the flow does not unbalance the seats. The MK50 can use a wider range of its stroke to give accurate control; less offset and rangeability up to 20:1. Quiet Operation — typically 5-10 dB less than conventional globe style regulators. The disc and plate are always in contact, which eliminates chattering. Straight-through flow minimizes turbulence. Multiple orifices in the plate and disc divide the flow stream into smaller flow components. Minimum Maintenance — The MK50 sliding gate seats require no special tools for disassembly. The seats are pre-lapped at the factory and are self-lapping while in operation ensuring a continual 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 50 Self-Operated Back Pressure Regulators The upstream pressure is sensed beneath the diaphragm. (A sensing line is required on sizes: 2-1/2", 3", and 4"). As the upstream pressure exceeds the setpoint, pressure is exerted on the diaphragm which raises the stem to modulate the disc (the movable component of the sliding gate seat set) toward the open position. As the seats open, upstream pressure will be regulated to the required setpoint. A decrease in pressure relaxes the spring and diaphragm to move the seats toward the closed position.

Mark 50 Self-Operating Back Pressure Regulators Mark 50 Series Ideal for gas and liquids Superior for steam Heavy duty housing can withstand full inlet pressure rating Optimized, low rate springs for increased accuracy Breather port for actuator venting Internal sensing simplifies installation, improves response time Jorlon diaphragm - proprietary modified PTFE excellent for high cycling, chemical resistance, steam service Sliding Gate Trim reduce or replace trim with ease Straight through flow: less noise, less wear, better rangeability, longer seat life Jorcote - advanced ceramic coating delivers...

Mark 50 Self-Operating Back Pressure Regulators Seat Materials: • Jorcote on SST — Standard • Other materials available — Consult factory Diaphragm Materials: • Stainless Steel — Standard on 1/4" - 2" (DN8-DN50) • Buna-N — Standard on 2-1/2" - 4" (DN65-DN100) • Jorlon — On steam service 2-1/2" - 4" (DN65-DN100) See page 12 of this brochure for details. • Viton — Optional End Connections: • Threaded — FNPT, BSPT, BSPP (1/2" - 2" only, DN15-DN50) • ANSI Flanges (150#, 300#, 600#) • DIN Flanges (PN10/16, PN25/40) • JIS Flanges (upon request) Service: Steam, water, oil, gas, air and chemicals Shutoff:...

Mark 50 Self-Operating Back Pressure Regulators Cv Versus Build-Up Data Size NPS

Mark 51 Self-Operating Back Pressure Regulators Cv Versus Build-Up Data Model Mark 51 Size NPS Installed Cv is the Failure Cv for Safety Relief Valve Sizing. Assumes SST diaphragm, optimal spring range for set point, and minimum flow = 5% of Cv. Shaded areas indicate valve reaches full Cv before offset is attained.

Mark 50 Self-Operating Back Pressure Regulators Maximum Working Pressure, BAR Maximum Working Pressure, PSI Notes: 1. Double bolting option is required to reach pressures indicated in parentheses ( ). 2. If weld flanges are supplied, use ratings in "TE" column or flange rating, whichever is less (i.e. ANSI 600/900 flanges or PN64/100 flanges).

Mark 50 Self-Operating Back Pressure Regulators Mark 50 / Mark 50QC*: Threaded & FSW Ends Mark 50 / Mark 50QC*: Threaded & FSW Ends, Metric

Mark 50 Self-Operating Back Pressure Regulators Mark 50: Integral Flanges - ANSI, CS & SS Bodies Dimensions (inches) ANSI Flange Mark 50: Companion Flanges - ANSI, Ductile & Bronze Bodies - Metric Note: Dimensions for DN65 to DN80 sizes apply to DI bodies also. 1 Mark 50: Integral Flanges - Metric Note: Dimensions for 2-1/2" to 4" sizes apply to DI bodies also. 1 Mark 50: Companion Flanges - ANSI, Ductile & Bronze Bodies