Model 1078

Description

The Model 1078 is a pilot-operated valve, specifically designed to reduce blanketing gas losses on low pressure storage tanks. It opens and closes automatically as required, to maintain a closely controlled blanket pressure. The simple design, increases reliability and lowers maintenance cost.

Line Sizes

• 1" (DN25)
• 2" (DN50)

End Connections

• 1" & 2" FNPT (screwed)
• 1" 150# integral RF flanges
• 1" 300# weldneck RF flange
• 2" 150# & 300# RF weldneck flanges DN25 (PN40), DN50 (PN16) & DN50 (PN40) weldneck flanges
• Special configurations are available on request: Any combination of above. Larger size reducing flanges.

Features

• Versatile: Single valve system offers wide variety of configurations to meet every blanketing application. Self cleaning flow design.
• Top Entry Design: Compact and light weight yet allows complete access to the valve internals without being removed from the tank. Only time the diaphragm case needs to be disassembled is when replacing the diaphragm.
• Stability: Pressure balanced pilot. Fluctuations in supply pressure does not affect set point
• Performance: Valve set point can be verified 100% on the tank, without removal and without flowing supply gas into the tank. Temperature changes have no appreciable effect on set point.
• Lower Maintenance Costs: Uses standard o-rings for seat and seals.

Outlet Pressure Ranges

0.50" to 5" WC | (1.24 - 12.4 mbar)
5" to 14" WC | (12.4 - 34.8 mbar)
14" to 30" WC | (34.8 - 74.7 mbar)
1.0 to 1.5 psig | (69 - 103 mbar)
1.5 to 3.0 psig | (103 - 207 mbar)
3.0 to 14.0 psig | (0.2 - 0.96 bar)
0" to 1-1/2" WC (vac) | (0 - 3.7 mbar)
1-1/2" to 6" WC (vac) | (3.7 - 14.8 mbar)

Applications

On many low-pressure storage tanks the operating range is very low, which makes blanketing and venting system selection/design a challenge for the engineer. The Vacu-Gard® makes the job much easier. First, the Vacu-Gard® set point definition is where the blanketing valve closes bubble tight. This gives the largest dead band between the blanketing valve set point and the set point of the relieving device, and therefore will reduce losses. Second, the Vacu-Gard® has a wide range of available settings, from vacuum to 14 psig, that make proper selection easier.