Safety valve for pressurized steam systems
The Lundberg Pressure-Vacuum Relief Valve is provided as a safety valve to accommodate
upset conditions in pressurized steam systems.
This type of relief valve is completely mechanical in operation and fitted with suitable adjusting
counterweights, and is designed to operate under preset conditions within the range of 0 to 7
inches of water column vacuum or 0 to 7 psig pressure. The pressure setting is completely
independent of the vacuum setting.
Six Sizes Available
The Lundberg Pressure-Vacuum Relief Valve is sized to suit the installation. The proper
operation of this device is dependent upon mounting on a flat, square, and true companion flange.
Valve size is an indication of connecting flange of ANSI class 150 standard drilling. Normally
supplied for horizontal mounting, the valve can be supplied on special order for either right or left
side vertical connection. Valves can also be supplied for pressure only or vacuum only.
For kraft mill service, the valve body and disc is constructed of T-304L stainless steel. For
sulfite mill service, the unit is of T-316L stainless steel body and disc. Weights are of mild steel.
The disc seats are of EPDM. Other materials available upon request.
The Pressure-Vacuum Relief Valve is currently available in the following sizes with maximum
flows as listed.
Size Pressure Vacuum
Relief at Relief at
7 psig 7 in W.C.
lbs cu. ft.
steam/min air/min.
10 950 1,500
12 1,450 1,900
14 2,150 2,800
16 2,850 3,700
18 3,750 5,000
24 5,850 11,000
A.H. Lundberg, Inc.
P.O. Box 1506,
Everett, WA 98206
(206) 2584617
FAX (206) 258-4616
Pressure Vacuum Relief Valve