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Self-Operated Rear Pressure Regulating Valve

Keywords: metering pump accessories

Classification:

Self-operated regulating valve

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  • DESCRIPTION

    Features of self-operated rear pressure regulating valve:

     

    In layman's terms, the self-operated post-valve pressure regulating valve controls the pressure behind the valve. It consists of a control valve, an actuator and a spring that sets the pressure. It is suitable for non-corrosive liquids, gases and steam, starting in the system pipeline. The function of pressure control behind the valve, when the pressure behind the valve increases, the control valve closes.

     

     

     

    Self-operated rear pressure regulating valve structure

     

     

    Self-operated rear pressure regulating valve parameters:
     

    Technical Parameters

    Nominal diameter

    DN15、20、25、32、40、50、65、80、100、125、200、250mm

     

     

    Nominal pressure

    PN1.6、4.0MPa

     

     

    Flange standard

    ANSl, JIS, DIN, GB, JB (special ones can be provided by users)

     

     

    Valve body material

    Cast steel, stainless steel

     

     

    Valve core material

    Hard seal: stainless steel 

     

     

    Soft seal: stainless steel inlaid rubber ring

     

     

    pressure balance

    Stainless steel bellows (DN15-125), balanced diaphragm (DN150-250)

     

     


    Working principle of self-operated rear pressure regulating valve:

     

    The self-operated pressure regulating valve is used to control the pressure behind the valve. The mode of action of the pressure regulating valve is a pressure-closing type. The medium flows into the valve body in the direction of the arrow, is throttled by the valve core and valve seat, and is output. The other path passes through the condenser (the medium is steam). After cooling, it is introduced into the actuator to act on the diaphragm, causing the valve core to move accordingly to achieve the purpose of pressure reduction and pressure stabilization. If the pressure behind the valve increases, the force acting on the diaphragm increases, compressing the spring, driving the valve core, and reducing the valve opening until the pressure behind the valve drops to the set value. In the same way, if the pressure behind the valve decreases, the force acting on the diaphragm decreases, and the reaction force of the spring drives the valve core to increase the valve opening until the pressure behind the valve rises to the set value.

    Temperature range of self-operated rear pressure regulating valve:

     

    allowable operating temperature

    Nominal diameter

     

    15-125mm

    150-250mm

    Sealing type

    Hard seal

    ≤150℃

    ≤140℃

    Cooling tank ≤200℃

    Cooling tank and extension ≤200℃

    Cooling tank and heat dissipation ≤200℃

    Cooling tank and extension ≤200℃

    Soft seal

    ≤150℃

    Structure and composition

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    valve body

    valve seat

    valve shaft

    cap

    membrane cover

    Diaphragm

    spring

    Adjusting nut

    pressure tube

    bellows

    Balanced diaphragm

    filling valve