DL-56 Series

Dome Loaded High Pressure Regulator

The DL-56 is a compact and robust design which employs a unique “Dual Piston” set up that enables the user to control pressure up to 6000 psig (414 bar) with as little as 40 psig (3 bar) of dome pressure. All of this is accomplished within the smallest envelope the industry has to off er. The regulator portion of this unit was patterned after the time tested PR-56 Series, which is widely recognized as a benchmark of performance and quality.

Offering the utmost in economy and safety, this unit is constructed from brass alloy 360. A carefully engineered all 316L stainless steel piston sensor unit offers good sensitivity and repeatability. An independent test was run and showed that the unit’s ability to repeat to a set point and low operating hysteresis is unsurpassed through out the industry.

Completing this design is the addition of an anodized aluminum (316 stainless steel optional) dome unit. The inlet ring to the dome is freely rotating and captured by a high tensile snap ring. This feature allows easy positioning and alignment of the dome gas line within a customer’s system while maintaining excellent leak integrity.

  • Gas or liquid service
  • Brass (alloy 360) construction
  • Better than 25 Ra finish in diaphragm cavity
  • Stainless steel piston sensor
  • 20 micron inlet filter
  • Bubble tight shutoff
  • Dome ratios are 11:1; 20:1; 43:1, 56:1, 76:1, 108:1, 122:1 and 172:1
  • Proof pressure is 2 times maximum working pressure
  • Burst pressure is 4 times maximum working pressure
  • Weight: 5.1 lbs (2.31 kg)
  • Mounting style is in line or panel (see Outline and mounting dimensions)


Maximum Temperature & Operating Inlet Pressures
Seat Material Maximum Temperature @ Maximum Operating
Inlet Pressure
Tefzel® 150° F (66° C) @ 3600 psig (24.82 MPa)
PCTFE 175° F (80° C) @ 6000 psig (41.37 MPa)
Polyimide 175° F (80° C) @ 6000 psig (41.37 MPa)
PEEK 175° F (80° C) @ 6000 psig (41.37 MPa)


View further documentation here