Graco Husky 205 D12091 Air Operated Double Diaphragm Pump PP PTFE 1/4 in NPT 18.9 L/min 7 Bar

The Graco Husky 205 D12091 is a compact air operated double diaphragm pump designed for industrial liquid transfer, chemical handling, sampling, dosing, and low-flow process applications. This non-metallic bolted pump uses a polypropylene fluid section and polypropylene center section, providing practical resistance to many water-based chemicals and compatible process fluids.

The D12091 configuration uses PTFE balls, polypropylene seats, and two-piece PTFE/EPDM diaphragms. This material combination supports reliable operation with compatible acidic, alkaline, and solvent-containing fluids, but chemical compatibility must always be verified against the actual fluid before installation.

With a maximum flow rate of 18.9 L/min and a maximum working pressure of 7 bar, this 1:1 pneumatic pump is suitable for compact transfer systems where electrical power is not preferred or where air-operated equipment is required. The 1/4 in. NPT end ports allow straightforward connection to small process lines and laboratory or production equipment.

Spring-loaded check valves improve priming performance and allow the pump to operate in different mounting orientations. The inlet and outlet are interchangeable, helping simplify piping layouts in confined industrial installations.

Key Features

• Compact Husky 205 pneumatic diaphragm pump
• Maximum flow rate of 18.9 L/min
• Maximum working pressure of 7 bar
• Polypropylene fluid section and center section
• PTFE balls and polypropylene seats
• Two-piece PTFE/EPDM diaphragms
• 1/4 in. female NPT fluid and air connections
• Spring-loaded check valves for improved priming
• End-port configuration
• Suitable for compatible industrial chemicals and process fluids

Applications

• Chemical transfer systems
• Industrial fluid dosing
• Wastewater and treatment equipment
• Laboratory and pilot process systems
• Small-scale coating transfer
• Detergent and cleaning-fluid handling
• General manufacturing fluid transfer
• Compatible acid and alkali handling

FAQ

Q1: What is the maximum flow rate of D12091?
A: The maximum flow rate is 18.9 L/min, equivalent to 5.0 GPM.

Q2: What is the maximum operating pressure?
A: The maximum air pressure and maximum fluid pressure are both 7 bar or 100 psi.

Q3: What are the fluid connection sizes?
A: The fluid inlet and outlet are both 1/4 in. female NPT.

Q4: What materials are used in the pump?
A: The fluid section and center section are polypropylene. The balls are PTFE, the seats are polypropylene, and the diaphragms are two-piece PTFE/EPDM.

Q5: What is the maximum fluid temperature?
A: The maximum operating temperature for this D12091 configuration is 66°C.

Q6: Can the pump handle solids?
A: It can handle particles up to 1.5 mm, subject to fluid properties and operating conditions.

Q7: Is D12091 suitable for every chemical?
A: No. Confirm compatibility of the process fluid with polypropylene, PTFE, EPDM, and fluoroelastomer materials before use.