Zahroof Valves Inc. has launched its newest product: the ZVI unloader valve. The ZVI unloader valve is a patent-pending piston-style unloader, designed to greatly improve reliability over traditional finger style unloaders, and features a much lower added clearance volume compared to plug style unloaders.
Unlike a plug-type unloader, there is not a large increase in clearance volume in the cylinder that can detrimentally affect the compressor throughout. The flow through the unloader is better than in the case of plate or channel valves, improving unloaded power as well as eliminating drag forces and aerodynamic flutter of valve elements. The new unloaders do not have the misalignment/assembly issues of plug style unloaders. The actuation force required for the ZVI unloader valve is much less than that required for a plate, channel or plug style unloader.