Hosco Finishing Systems Components’ new Hosco BPV-150 Mechanical Pressure Relief Valve is said to relieve paint and solvent circulating system pressure in the event of system over-pressurization. The cavity-free and silicone-free valve can replace expensive “rupture disk” or conventional relief valves. The valve opens and closes automatically when required and will not halt production by shutting down in an over-pressurization situation.
Conventional pressure relief valves are often connected by an offset tube away from the fluid line. This can result in the fluid, particularly paint, to become stagnant leading to agglomeration and sedimentation which can eventually cause a malfunction, damage the safety valve or break loose into the paint system creating a paint finish defect on the finished product.
By contrast, the BPV-150 is designed to be located directly on the supply line. Should a pressure switch fail to shut off the pump before pressure reaches 300 psi, the pressurized fluid will push the face of the valve causing its spring to compress, allowing the fluid to pass through to the by-pass return line, and relieving the pressure in the supply line. The by-pass return is connected to the supply tank or drum. When the supply line pressure drops below 300 psi, the valve will close returning the system to normal operation.
The valve offers several other features. The top of the valve is equipped with a vent stone that allows it to move back and forth freely without fighting compression or vacuum. Being positioned close to the circulating main line area, the cavity-free design of the valve/seat is said to eliminate dead flow areas where paint could settle and produce paint finish dirt defects. According to the company, this mechanical valve that requires no service, so over-pressurization will not result in system shut downs as is necessary with servicing ruptured valves.
The valve assembly comes complete with a 1.50? adapter and installation manual. A 2? main line adapter is also available as an option in lieu of the 1.50? tee.