Tank Blanketing Valves
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 0,5 bar). As a standard feature, the MK518 is provided with soft seals for ANSI Class VI shutoff. The valve is also leak-proof under vacuum conditions.
The Mark 518 back-pressure relief valve is used for maintaining the pressure of air and gases in the positive inches w.c. (mbar) pressure range.
- 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 back-pressure settings – Choose from six pressure ranges for set points ranging from 1” w.c. to 7 psi (3mbar to 0,5 bar)
- Long service life – All metal wetted parts produced from stainless steel or Hastelloy C for durability and long life
- Tight shutoff – Soft seats for ANSI Class VI shutoff
Sizes: 1″, 2″, 4″ (DN25, DN50, DN100)
End Connections: ANSI (150), DIN (PN16), NPT (1″/DN25 size only)
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
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