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Relief Valve
FITOK relief valves are available with a wide range of set pressures for use with both liquid and gas media. They cater to general industry as well as medium-to-high-pressure applications and come with a variety of connection types and sizes.
Proportional Relief Valves, RL, RM, and RV Series
RL, RM, and RV Series Proportional Relief Valves open proportionally as upstream pressure exceeds the set pressure and close gradually as pressure decreases. These valves regulate pressure by diverting media flow to protect piping components. They feature an adjustable bonnet cap, adjustable set pressure, and a variety of end connection types, sizes, and seal materials.
RV, RL and RM Series.
◎ Set pressure:
RV series : 7 color coded springs available for a wide range of set pressure, 50 to 6000 psig @ 70°F (3.4 to 414 bar @ 20°C)
RL series:0 to 225 psig @ 70°F (0.68 to 15.5 bar @ 20°C)
RM series : 3 color-coded springs available for a wide range of set pressure, 50 to 1500 psig @ 70°F (3.4 to 103 bar @ 20°C)
◎ Maximum outlet pressure :
RV series : 1500 psig (103 bar)
RL series : 225 psig (15.5 bar)
RM series : 1500 psig (103 bar)
◎ Working temperature: -10°F to 300°F (-23°C to 148°C)
◎ Liquid or gas service
◎ Adjustable bonnet cap and adjustable set pressure
◎ Lead seal through lock wire holes to lock proportional relief valve therefore to secure a set pressure effectively
◎ Variety of seal materials
◎ Label identifies the set pressure range
◎ Liquid or gas service
Set Pressure and Resealing Pressure Relief Valve
Set pressure : The set pressure is the upstream pressure at which the first indication of flow occurs. The repeatability of set pressure of each valve after initial relief is ±5% while room temperature.
Resealing pressure : The resealing pressure is the upstream pressure at which there is no indication of flow. Resealing pressure is always lower than set pressure.
Applications
Relief valves are proportional valves that open gradually as the pressure increases. Consequently, they do not have a capacity rating at a given pressure rise (accumulation), and they are not certified to ASME or any other codes.
Some system applications require valves to meet specific safety codes. The system designer and user must determine when such codes apply and whether these valves conform to them.
FITOK proportional relief valves should never be used as ASME Boiler and Pressure Vessel Code safety relief devices.
FITOK proportional relief valves are not “Safety Accessories” as defined in the Pressure Equipment Directive
2014/68/EU.
One-Piece Body Relief Valves, RUV Series
RUV Series One-Piece Body Relief Valves open when system pressure exceeds the set pressure, allowing media to flow out and relieve excess pressure, then close when pressure decreases to the resealing level. The compact, one-piece body design supports cracking pressures from 25 to 500 psig (1.7 to 34.5 bar) and a working temperature range of -10°F to 300°F (-23°C to 148°C).
Features
◎ Compact design with one-piece body
◎ Standard seat: FKM
◎ Temperature: -10°F to 300°F (-23°C to 148°C)
◎ Cracking pressure: 25 to 500 psig (1.7 to 34.5 bar)
◎ Set pressure by nut adjustment and spring replacement
Cylinder Relief Valves, RT Series
RT Series Spring Relief Devices are designed for applications such as portable cylinders and pressure vessels, serving as a safety mechanism. When system pressure reaches the set pressure, the device automatically opens to release excess pressure and closes once the pressure stabilizes. The maximum set pressure range is 700 ～ 800 psig (48 ~ 55 bar), with a working temperature range of -20°F to 250°F (-29°C to 121°C).
Features
◎ Spring relief devices can be used with FITOK sample cylinders as a safety device
◎ Working Temperature: -20°F~250°F (-29°C~121°C)
◎ When the system pressure reaches the set pressure, the device will open automatically to release the excess pressure in the system. After stabilizing the system pressure, the device will close automatically.
Medium and High Pressure Relief Valves
Medium Pressure Relief Valves, HSR and HAR Series
20RS and 20RA Series Medium Pressure Relief Valves feature a maximum set pressure of up to 20,000 psig (1,379 bar) and a working temperature range of 32°F to 400°F (0°C to 204°C). A soft seat design ensures bubble-tight shutoff for gas applications. These valves can be mounted in any direction.
Features
◎ Working temperature range: 32°F to 400°F (0°C to 204°C)
◎ Liquid or gas service
◎ Soft seat design to provide bubble tight shut-off of gas
◎ Mountable in any direction
High Pressure Relief Valves, HMR Series
HMR Series High Pressure Relief Valves support a maximum set pressure of up to 60,000 psig (4,137 bar) and a working temperature range of -110°F to 400°F (-79°C to 204°C). Metal-to-metal seating provides effective shutoff for both liquids and gases. These valves can be mounted in any direction.
Features
◎ Set pressure: 3,000 to 60,000 psig (207 to 4137 bar)
◎ Working temperature range: -110°F to 400°F (-79°C to 204°C)
◎ Liquid or gas service
◎ Factory-set, test, locked, and tagged with the set pressure
◎ Lock wire the cap and body together to maintain relief setting
◎ Mountable in any direction
◎ Metal-to-metal seating to provide shut-off of liquids and gases commercial tightness standards
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