Excess Flow Valves
Model: SLF-150LB SLF-300LB
Application overview:
The 166 type excess flow valves are single flanged and belong to overflow check valves. Like the MGM excess flow check valve in the United States, they are equipped with orifices in the disc mechanism to achieve pressure balance, and will automatically reopen after the pressure on both sides of the pipeline is balanced. The flange will fit the bolt pattern of 150 # or 300 # flange. Standard gaskets shall be used on both sides of the valve.
Material table of overflow valve:
Valve body: stainless steel (low temperature)
Poppet valve: stainless steel
Nut: stainless steel
Spring: stainless steel
Cotter pin: A105
Features of 166 type overflow valve:
Designed for sliding in steel pipes in Schedule 80 or below.
Bolts for 150 and 300 lb American standard steel pipe flanges.
Ring joints can also be equipped with valves.
Wide flow passage can provide low pressure drop.
All heavy steel structures can withstand temperatures of - 50 to more than 300 degrees Fahrenheit and internal pressures of up to 1000 psig.
The complete 304 or 316 stainless steel construction can be used in corrosive environments.
Operating principle of overflow valve:
Overflow valve EXCESS FLOW CHECK VALVES is a kind of safety protection valve. It mainly adopts cone type sealing surface. The spring controls the flow, and uses the flow rate and thrust of the medium to control the flow on the pipeline. When the flow pressure on the installation pipeline exceeds the set pressure of the spring, it will automatically close. When it opens automatically, the inlet medium will flow through the small hole on the valve core. After the pressure at both ends is balanced, the spring will automatically retract the valve to open. It is used in non corrosive media such as oil products, liquefied gas, liquid ammonia and gaseous ammonia. It is closed immediately when the flow rate of medium in the pipeline exceeds the set value, and automatically closed when the flow rate of damaged pipeline or accessories is too large to prevent the occurrence or expansion of accidents. It is generally installed at the inlet and outlet of storage tank or pipeline outlet to protect the safety and reliability of downstream equipment.
