Blackmer Bypass Valves

Blackmer Bypass Valves

Blackmer differential bypass valves are designed to protect pumps and system components from excessive pressure damage, and no LP gas pump installation is complete without one. Blackmer offers five different models that provide full-flow pressure control to 250 U.S. gpm (946 L/min) at 120 psid (8.27 Bar). Installation is easy with NPT tapped ports in sizes from 3⁄4″ to 2″. All models are suitable for both LP gas and anhydrous ammonia service.



Technical Details
Blackmer bypass valves have no small, easily plugged, sensing passages; and with only two moving parts, their operation is simple and reliable. They open precisely at the preset spring pressure, and they close smoothly and quietly, thanks to a patented dash-pot design.

Model BV0.75(ports are 3⁄4-inch NPT tapped)
Model BV1 (ports are 1-inch NPT tapped)
These models are commonly used for cylinder-filling system. Either valve can be used with 1.25 or
1.5-inch Blackmer pump models.

Model BV1.25 (ports are 1-1⁄4-inch NPT tapped)
Model BV1.5(ports are 1-1⁄2-inch NPT tapped)
These models are normally used for bobtail trucks and smaller bulk plant systems. Either valve can be
used with 2 or 3-inch Blackmer pump models. Both valves are available with optional springs for
use with the LGL 158 or LGLH2.

Model BV2 (ports have 2-inch NPT companion flanges, 1-1⁄4-inch and 1-1⁄2-inch NPT and WELD
bolt-on flanges are available)
The BV2 model is widely used for transports or larger bulk plant systems.
It is recommended for use with 3 and 4-inch Blackmer pump models. The BV2 is factory set
at 125 psi.

For more information on these products, please see the download(s) below:
(link to PDF downloads)