Mark 978OR Series

• A variety of FDA/USP Class VI, o-ring materials to choose from
• Mechanically and electropolished internal components – 20Ra (0,5µm) finish, standard; 8Ra (0,2µm) optional
• Gravity draining/no holdup and a variety of installation orientations possible
• A wide variety of true flow characteristics available

• Size: 1/2″ though 2″, 4″ (DN15 through DN50, DN100 )
• End Connections: ASME, DIN and ISO tri-clamp, extended tube weld
• Cv (Kv) & Flow Characteristic: 0.2 – 200 (0,17 – 172), linear, equal percentage or quick opening trim characteristics
• Max. Pressure/Temperature: 450 psi (31 bar) at 100°F (38°C), dependent upon construction; 450 psi (31 bar) at 450°F (232°C) body and o-ring dependent upon construction
• Wetted Material: ASME SA479 316L (UNS 31603) is standard. EN 10272:2000 GR 1.4435, AL-6XN®, Hastelloy C-22 and others are optional
• Surface Finish: ASME BPE SF5, 20Ra (0,5µm) electropolish is standard, 8Ra (0,2µm) optional
• Stem Seal – O-ring: Various – all certified to FDA/USP Class VI
• Soft Seat Option (CV > 3.5 only): PTFE FDA/USP Class VI; PEEK FDA/USP Class VI

• CRN (Canadian Registration Number)
• PED Category 1 (Pressure Equipment Directive)
• SEP Declaration (Sound Engineering Practice)
• EC Declaration of Conformity
• ATEX Certified
• All products use FDA and USP Class VI approved soft goods and seals where possible. Consult each product data for details

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The 3D STEP files provided on this website contain proprietary information and are intended solely for use by authorized customers. These files must not be used, distributed, or repurposed by third-party vendors for promotional, marketing, or any other non-customer-related activities. Unauthorized use may violate intellectual property protections and confidentiality agreements.

Mark 978OR Series with Actuator
1/2″ Mark 978 Series with O-Ring and 35M Actuator
1/2″ Mark 978 Series with O-Ring and 55M Actuator
3/4″ Mark 978 Series with O-Ring and 35M Actuator
3/4″ Mark 978 Series with O-Ring and 55M Actuator
1″ Mark 978 Series with O-Ring and 35M Actuator
1″ Mark 978 Series with O-Ring and 55M Actuator
1-1/2″ Mark 978 Series, O-Ring, 55M Actuator
1-1/2″ Mark 978 Series, O-Ring, 85M Actuator
2″ Mark 978 Series, O-Ring, 55M Actuator
2″ Mark 978 Series, O-Ring, 85M Actuator

Mark 978OR Series with Actuator and Side Positioner
1/2″ Mark 978 Series, O-Ring, 35M, & 16IP Side Positioner
1/2″ Mark 978 Series, O-Ring, 35M, & 16IQ Side Positioner
1/2″ Mark 978 Series, O-Ring, 35M, & 16PP Side Positioner
1/2″ Mark 978 Series, O-Ring, 55M, & 16IP Side Positioner
1/2″ Mark 978 Series, O-Ring, 55M, & 16IQ Side Positioner
1/2″ Mark 978 Series, O-Ring, 55M, & 16PP Side Positioner
3/4″ Mark 978 Series, O-Ring, 35M, & 16IP Side Positioner
3/4″ Mark 978 Series, O-Ring, 35M, & 16IQ Side Positioner
3/4″ Mark 978 Series, O-Ring, 35M, & 16PP Side Positioner
3/4″ Mark 978 Series, O-Ring, 55M, & 16IP Side Positioner
3/4″ Mark 978 Series, O-Ring, 55M, & 16IQ Side Positioner
3/4″ Mark 978 Series, O-Ring, 55M, & 16PP Side Positioner
1″ Mark 978 Series, O-Ring, 35M, & 16IP Side Positioner
1″ Mark 978 Series, O-Ring, 35M, & 16IQ Side Positioner
1″ Mark 978 Series, O-Ring, 35M, & 16PP Side Positioner
1″ Mark 978 Series, O-Ring, 55M, & 16IP Side Positioner
1″ Mark 978 Series, O-Ring, 55M, & 16IQ Side Positioner
1″ Mark 978 Series, O-Ring, 55M, & 16PP Side Positioner
1-1/2″ Mark 978 Series, O-Ring, 55M, & 16IP Side Positioner
1-1/2″ Mark 978 Series, O-Ring, 55M, & 16IQ Side Positioner
1-1/2″ Mark 978 Series, O-Ring, 55M, & 16PP Side Positioner
1-1/2″ Mark 978 Series, O-Ring, 85M, & 16IP Side Positioner
1-1/2″ Mark 978 Series, O-Ring, 85M, & 16IQ Side Positioner
1-1/2″ Mark 978 Series, O-Ring, 85M, & 16PP Side Positioner
2″ Mark 978 Series, O-Ring, 55M, & 16IP Side Positioner
2″ Mark 978 Series, O-Ring, 55M, & 16IQ Side Positioner
2″ Mark 978 Series, O-Ring, 55M, & 16PP Side Positioner
2″ Mark 978 Series, O-Ring, 85M, & 16IP Side Positioner
2″ Mark 978 Series, O-Ring, 85M, & 16IQ Side Positioner
2″ Mark 978 Series, O-Ring, 85M, & 16PP Side Positioner

Mark 978OR Series with Actuator and Top Positioner
1/2″ Mark 978 Series, O-Ring, 35M, Top Positioner
1/2″ Mark 978 Series, O-Ring, 55M, Top Positioner
3/4″ Mark 978 Series, O-Ring, 35M, Top Positioner
3/4″ Mark 978 Series, O-Ring, 55M, Top Positioner
1″ Mark 978 Series, O-Ring, 35M, Top Positioner
1″ Mark 978 Series, O-Ring, 55M, Top Positioner
1-1/2″ Mark 978 Series, O-Ring, 55M, Top Positioner
1-1/2″ Mark 978 Series, O-Ring, 85M, Top Positioner
2″ Mark 978 Series, O-Ring, 55M, Top Positioner
2″ Mark 978 Series, O-Ring, 85M, Top Positioner