CDS-John Blue DP-291 Diaphragm Pump

CDS-John Blue DP-291 Diaphragm Pump

2 reviews
Item Code:
42.0 lb
John Blue
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List price:

Select this CDS-John Blue DP-291 Diaphragm Pump for your sprayer systems requiring medium to high pressure. Rated with a maximum pressure of 725 PSI and a flow rate of 29.1 GPM, it's a superb performer in assemblies used for deploying liquids in agricultural, commercial and industrial settings. This product replaces the previously sold CDS-John Blue DP-230 Diaphragm Pump.

Manufacturer Description:

The CDS-John Blue High Pressure Diaphragm Pumps are an excellent choice for high-pressure sprayers, such as air blast sprayers and poultry house washers and industrial machinery. These three and four diaphragm semi hydraulic diaphragm pumps are designed to ensure a perfect mechanical balance and better volumetric distribution of the liquid. The CDS-John Blue High Pressure Diaphragm Pumps are factory equipped with the unique pulsation dampening system with 34 holes that absorbs pulsation pressure on all pistons equally. All fluid end-housing components are anodized aluminum. The valves are stainless steel with exclusive spheric section shaped design for perfect sealing. Our diaphragms are made from chemical resistant elastomers, which increases the pump's life even when they are used with aggressive agricultural and industrial chemicals.
  • The heads are designed with a patented technology that includes an aluminum die-cast core inside a polypropylene structure offering superior strength.
  • Washers and diaphragm bolts are in 316 stainless steel, an exclusive feature.
  • Die cast crankcase incorporating a new cooling system.
  • New chemically resistant diaphragm material pre-deformed to reduce the amount of deflection, increasing diaphragm life. The diaphragm material is compatible with most of the corrosive chemicals on the market today.
  • A short crankshaft stroke means the longest life possible.
  • New connecting rods in special bronze alloy offer economical and trouble free service.
  • 316 stainless steel inlet and outlet check valves.


  • Max flow: 29.1 gpm
  • Max pressure: 725 psi
  • Max speed: 550 rpm
  • Shaft: Dual 1-3/8" male 6 spline PTO shaft
  • Port sizes: 1-1/2" HB inlet, 3/4" NPT outlet
  • Pump shaft rotation: CW and CCW
  • Diaphragms: 3, semi-hydraulic, Desmopan material
  • Housing: Anodized aluminum
  • Recommended control unit: SC-1480-3 (remote mount)
  • Max fluid temperature: 140 F
  • Weight: 55.6 lbs
Customer Reviews
5.0 Based on 2 Reviews
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Filter Reviews:
George B.
  • Use Case Agriculture
  • Ease of Use Very Easy
  • Was Customer Service Helpful? I didn't interact with Customer Service
Jonn blue dp291

Smoothest running diaphragm pump I’ve ever seen. Looks like it’s built to last! Works great.

Sprayer Depot

We hope it does a great job for you!

George B.
  • Use Case Agriculture
  • Ease of Use Very Easy
  • Was Customer Service Helpful? I didn't interact with Customer Service
CDS-John Blue DP-291 Diaphragm Pump

Nicely built pump. It should perform well for years to come.

Sprayer Depot

Gotta love a John Blue pump! Thanks for shopping with us!