Shand & Jurs 94020 Conservation Vent (Pressure & Vacuum)


Shand & Jurs 94020 Conservation Vent (Pressure & Vacuum)

The Shand & Jurs Model 94020 Conservation Vent is designed to utilize over 90 years of experience in producing high-quality and dependable conservation fittings. Continued design improvements provide these vents with high efficiency, maximum flow capacity, and minimum leakage. The easily serviceable configuration and lightweight construction reduce maintenance and installation costs.

Standard materials of construction are low copper aluminum, cast iron, ductile iron, cast steel, and 316 stainless steel for body materials. Aluminum, stainless steel, and steel body vents come standard with integral seats and have optional replaceable seats. Cast iron and ductile iron bodies come with replaceable seats as standard designs. Replaceable seats are made of corrosion-resistant molded thermosetting phenolic, Teflon, aluminum, 316 stainless steel, or stainless steel Teflon coated and are easily replaced.

Diaphragms are air cushions seated and are constructed of FEP Film for reliability and extended service life. Teflon diaphragms contribute to high resistance to adhesion of ice and gum formations, thus assuring protection against pallet sticking to the seating surface. The body is self-draining and drip rings keep condensates from the seating surfaces. The carefully engineered body, seat, and pallet assembly results in a superior combination of tight sealing and high capacity at low over-pressure with minimal blowdown.

Conservation Vents are available in a full range of sizes and configurations, such as an open vent, closed vent (pipe-away), cryogenic hoods, and flame snuffers. Standard pressure and vacuum settings are 0.5 oz/in2. The 94020 Conservation Vent is available with optional pressure and vacuum limit switches and visual indicators.

Shand & Jurs's “Expanda-Seal” option is available on all pressure pallet assemblies. This feature significantly reduces leakage. The ballooning effect of the FEP Diaphragm effectively seals the valve.

The “Expanda-Seal” feature ensures less than 0.5 SCFH of air at 95% of the set point.


  • Suitable materials available for corrosive/extreme temperature service pallet reaction lip for smooth lift and reseating
  • Pallet reaction lip for smooth lift and reseating
  • Vertical lift pallets assure reliable operation and maximum flow
  • Floating diaphragm results in a positive seal and minimal blow-down
  • “All-weather” coating, insulation jackets and steam jacketing options available
  • Capacity certified to API Standards


  • Sizes:
    2’’, 3’’, 4’’, 6’’, 8’’, 10” & 12”
  • Settings*:
    Standard Pressure & Vacuum: 0.5 oz/in2 (.865 in. W.C.)
  • Expanda-Seal Pressure Setting:
    1.5 oz/in2
    Minimum (Consult Factory for lower settings)
  • Maximum Setting W/O Modification:
    (Pressure) (Vacuum)**
    2”: 12 oz/in2 8 oz/in2
    3”: 12 oz/in2
    9 oz/in2
    4”: 12 oz/in2 11 oz/in2
    6”: 10 oz/in2 10 oz/in2
    8”: 8 oz/in2 8 oz/in2
    10”: 6 oz/in2 6 oz/in2
    12”: 5 oz/in2 5 oz/in2
  • Service and Body Material:
    Normal: Cast Low Copper Aluminum
    Low Temperature: Cast Low Copper Aluminum
    Severe: Cast Iron, Ductile Iron, Cast Steel, Cast 316 Stainless Steel
    Integral Seats: Same as body; Aluminum, 316 SS, Cast Steel with 316 Stainless Steel seat overlay
  • Temperature Range:
    Body and Seal -40oF to 220oF. Options for Process Temperature Ranges of -300oF to 500oF
  • Replaceable Seats:
    Ryton for: 2” size
    Aluminum for: 2”, 3”, 4”, 6”, 8”, 10” & 12” sizes
    316 Stainless Steel for: 2”, 3”, 4”, 6”, 8”, 10” & 12” sizes
    Teflon for: 2”, 3”, 4”, 6”, 8” sizes
    SS Teflon Coated for: 2”, 3”, 4”, 6”, 8”, 10” & 12” sizes
  • Type of Flange Connection:
    Screwed or flanged for: 2” & 3” sizes
    Flanged for: 4”, 6”, 8”, 10” & 12” sizes
    Raised face flange available, except for aluminum body material.
  • Options Available:
    Flame Snuffer for all sizes (open vent) and material, except low-temperature service. Closed vent for all sizes and materials. Material substitutions as required. Cleaning for LOX/LIN service.
    ** Modifications may be required to vacuum port for installations where product contamination may occur. See figure 4 for Principle of Operation. Caution— any obstruction to the vacuum port may alter the set point.


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