The CV40 control valve is a low pressure, full port dump valve. The full port allows for high flow rates, and its standard soft-seat design gives a consistent leak-free shutoff when the valve closes. Applications include discharging liquid or gas from separators, treaters, knockouts or other vessels. It can also be used for backpressure regulation when paired with a PC48 pressure controller, making it an economical choice for a variety of low-pressure applications.

  • Features include balanced plug control trim with a quick opening characteristic and adjustable top-works.
  • Available with a metal-to-metal seat.
  • The metal seat version comprises an un-balanced, hex-shaped plug to avoid sand buildup between the plug and cage.

FW Murphy is the exclusive BMD distributor for new equipment packages. 

FW Murphy Production Controls offers support for all our products. If you are unable to find the product that you need, please call us at 918-957-1000.


Sizes: 2”, 3” and 4”
Connections: Female NPT, flanged
Body Type: Globe, angle
Soft Seat Trim:
Trim Characteristic: Quick open
Trim Size: Full port and reduced port (1 size down)    
Trim Type: Balanced
Metal Seat Trim:
Trim Characteristic: Modified percent
Trim Size: 1.00”, 1.75”
Trim Type: Unbalanced
Pressure Rating:
500 psi: 2” NPT
250 psi: 2” Flanged
250 psi: 3” & 4” Flanged & NPT
Temperature Range:  -20° F to 400° F
Actuator Sizes:  #35
Input Signal Range: 3-15 or 6-30 psi
Body: Ductile iron
Bonnet and Plug: Nickel-plated carbon steel
Bonnet Flange: Carbon steel
Seat: 304 stainless steel
Stem: 304 stainless steel
Actuator Housing: Carbon steel
Bolting: A193 B7
Standard materials are good for NACE