A-Series Direct Acting with Threaded Connections


A-Series Direct Acting with Threaded Connections

Tuesday, January 23, 2024
A-Series Direct Acting with Threaded Connections image


AAD:  Cast Iron

ACD: Cast Steel

ASSD: Stainless Steel

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

Size Range: 2.5″ and 3″

Pressures: 7 – 150 psi

Flow Rate: 150 – 350 gpm



Fulflo valves can be mounted in any position. A tee may be inserted in the pump discharge line to mount the valve. The pipelines carrying the heavy valves must be well supported and overhung weights avoided. The correct size of the valve must be used, preferably equal to the size of the pipeline to which they are connected. Threaded valves (AAD and ACD) may be threaded into pipe nipples. Overhung weights on threads should be avoided. 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

The valve may be set with a hydraulic hand pump for cracking pressure. If a test stand is available, the 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 Direct Acting valves, adjust valve adjusting screw until valve slightly bleeds at the set bypass pressure and lock the 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 the 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” operations 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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