McMaster-Carr logo
    Filter by
    Inlet Thread Type
    Industrial Info Compare
    Thread Type
    System of Measurement
    Inlet Pipe Size
    Industrial Info Compare
    Pipe Size
    Industrial Info Compare
    Maximum Inlet Pressure
    Set Pressure
    Actuation
    Body Material
    Material
    Inlet Connection
    Maximum Pressure
    Gender
    Fitting Connection
    Valve Type
    Hex Size
    Attribute Image
    Diameter
    Attribute Image
    Inlet Gender
    DFARS Specialty Metals
    Export Control Classification Number (ECCN)
    Industrial Info Snippet
    U.S.–Mexico–Canada Agreement (USMCA) Qualifying
    Industrial Info Snippet
    Forward
    Enter e-mail addresses in the fields below
    Message
    Cancel
    Print
    How can we improve?
    Comments
    E-mail address (if you would like a response)
    Help me decide (beta)
    5 Products
    About Pressure-Relief Valves
    industrial info icon

    Choose the correct valve type and pipe size to safely manage the pressure of your system.

    Compact Pressure-Relief Valves

    Due to their small size, these valves are often installed on tanks in low-clearance areas. They begin opening at the set pressure. Nylon valves fully open at about 10% over the set pressure and steel valves fully open at about 50% over the set pressure. Valves begin closing as pressure drops and fully close when the system pressure is restored below the set pressure. All have a vent outlet to exhaust discharge directly. Set pressure is not adjustable.
    Steel Body—For Grease and Oil
    Image of Product. Front orientation. Pressure-Relief Valves. Compact Pressure-Relief Valves, Steel Body—For Grease and Oil.
    Inlet
    Each
    Pipe
    Size
    Location
    Max. Pressure,
    psi
    Relief Port
    Location
    Overall
    Ht.
    Set
    Pressure
    1-9
    10-Up
    BSPT Male Inlet and Relief Vent
    1/8
    		Bottom1Top1/2"0.3 psi1093K610000000000
    1/8
    		Bottom5Top1/2"1 psi1093K6200000000
    1/8
    		Bottom80Top1/2"45 psi1093K6300000000
     

    Air-Exhaust Flow Control Valves

    Image of Product. Thumb Screw Flow Adjustment. Front orientation. Contains Annotated. Air-Exhaust Valves. Air-Exhaust Flow Control Valves, Threaded Male Inlet, Flow-Adjustment Thumb Screw.
    Image of Specification. Front orientation. Contains Annotated. Air-Exhaust Valves. Air-Exhaust Flow Control Valves.

    Thumb Screw Flow

    Adjustment

    Install these valves in the exhaust ports of air directional control valves to control exhaust air speed without needing access to your cylinder. They control flow in one direction as air moves from the inlet to the exhaust port (meter out). Air flows freely in the opposite direction. Valves exhaust to the atmosphere and include a muffler to reduce the exhaust noise.
    Flow Coefficient (Cv)—Flow coefficient (Cv) is a measurement that indicates how much airflow can pass through a valve. When selecting between valves with the same port size, choose the valve with the higher flow coefficient to ensure it provides enough airflow to operate your system.
    Overall,
    mm
    No. of Flow
    Ports
    Inlet
    Size
    Max. Flow Rate
    @ Pressure
    Flow Coefficient
    (Cv)
    Max. Pressure,
    psi
    Body
    Material
    Hex Size,
    mm
    Dia
    Lg.
    Each
    Threaded Male Inlet
     
    Flow-Adjustment Thumb Screw
    21/8 BSPT10.59 scfm @ 100 psi0.201145Brass101435.89164K107000000
    21/4 BSPT17.66 scfm @ 100 psi0.313145Brass1418379164K10800000
     
    back to top