A-Series Internal Pilot with Flange Connections


A-Series Internal Pilot with Flange Connections

Tuesday, January 23, 2024
A-Series Internal Pilot with Flange Connections image


AAPF:  Cast Iron

ACPF: Cast Steel

ASSPF: Stainless Steel

  • API 520 & 614 Approved
  • Chatter-free operation
  • Mount in any position
  • Suitable for continuous duty

Size Range: 2.5″, 3″ & 4″
Pressures: 50 – 500 psi
Flow Rate: 150 – 600 gpm



Fulflo valves can be mounted in any position. A tee may be inserted in the pump discharge line to mount the valve. The pipe lines carrying the heavy valves must be well supported and overhung weights avoided. The correct size of valve must be used, preferably equal to the size of the pipe line to which they are connected. Flanged valves (AADF and ACDF) are bolted to the companion flange which may be threaded or welded to the pipe. The outlet of the valve should be piped to the supply tank, unless specific applications call for alternate piping of return lines. Care must be taken to have the discharge well below the oil level in the tank to prevent air entrainment and erratic operation.

Setting Valves

Valve may be set with a hydraulic hand pump for cracking pressure. If a test stand is available, valve should be connected to the discharge header with the pump bypass open, and the bypass gradually closed until the desired pressure registers on the gauge. For Internal Pilot Operated valves, adjust valve adjusting screw until approximately 5-7 GPM is flowing through the valve, at that point the main piston will open and then the valve will be considered at the set point, then lock adjusting screw. If a valve is required to bypass a given amount of fluid at a given pressure, a test stand having a flow meter in the pump discharge line must be available. With a valve adjusting for cracking pressure as above, continue closing bypass until the required flow registers on the flow meter and observe pressure. Readjust pressure, if necessary, to obtain desired pressure at desired flow.

Maintenance & Operation

Fulflo valves provide reliable “chatter-free” operation when the system is free of abrasives and foreign matter. Continuous filtration of the liquid used is strongly recommended.


Great Lakes Pump and Supply
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Great Lakes Pump & Supply Co.
1075 Naughton
Troy, MI 48083
Phone: 248-528-9100

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