Single stage and double stage rotary piston pumps for demanding industries

PS and PD Series

For reliability and ease of operation

The Stokes PS & PD series rotary piston pumps combine low initial investment with minimal operating costs, offering an economical and durable solution. Designed to deliver consistent vacuum performance even under demanding conditions, they provide long-lasting efficiency where reliability matters most.

Designed for reliability and ease of operation, the pump features a precision-balanced 3-cylinder design that minimizes vibration and ensures smooth, stable performance. An automatic lubrication system delivers optimized oil flow, while the integrated design prevents backflow to protect your process. 

Grease-lubricated bearings, isolated from the pump oil, maximize uptime and reduce maintenance requirements. With gas ballast included as standard and a fully self-contained, ready-to-install configuration, the system delivers dependable performance with minimal effort from day one.

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PRODUCT DETAILS

Features

For demanding industries

Built to perform in demanding environments, these pumps are trusted across a wide range of industries. From heat treatment and metallurgy to automotive manufacturing, PET processing, pharmaceuticals, and general industrial applications, they deliver reliable vacuum performance where durability, consistency, and uptime are critical.

Systemization options available

Available as complete, self-contained units ready for installation, they can also be configured into tailored pumping combinations to meet specific process requirements. This flexible systemization approach enables a broad range of vacuum solutions, ensuring optimal performance across diverse applications and operating conditions.

Maximum uptime

Designed for long-term reliability, the bearing is grease-lubricated rather than relying on pump oil. This separation reduces wear, minimizes maintenance, and helps ensure maximum uptime and consistent performance.

Low vibration operation

Built for robustness and efficiency, the Stokes PS & PD series features a streamlined design with minimal moving parts for long-term reliability. The enhanced three-cylinder configuration delivers smooth operation with reduced vibration and low noise, even in demanding industrial environments.

Ease of service

The simple, proven mechanism allows for quick and easy on-site servicing and maintenance. With a robust design built around fewer, easily interchangeable parts, maintenance and spare parts costs are kept to a minimum. Comprehensive service capability ensures your pump remains in peak operating condition throughout its lifecycle.

Flexible accessory options

A wide range of easy-to-fit accessories is available to tailor the pump to your application needs. Options include inlet filters, oil mist separators, water misers, EM gas ballast, and external oil purifiers, providing added versatility and optimized performance across a broad range of processes.

Download our Brochure

Stokes PS&PD Single and Double Stage Rotart Piston Pump Brochure

Filename
Stokes PS PD Series EN Web
Size
1 MB
Format
pdf
Download

Applications

  • Chemical processing
  • Leak detection
  • Metallurgy
  • Pharmaceuticals
  • Vacuum coating
  • Vacuum melting
  • Automotive

Product Specifications

 

  Units Stokes PS Series Stokes PD Series
    P300S P600S P1100S P330D P630D P1100D
Ultimate pressure w/o GB  mbar 0.03  0.03  0.03  0.01 0.01 0.01
Displacement m³/hr  288  580  1080  324 576  1080
Pump speed  rpm  652  616  555  588  615  500
Back pressure  bar(a)  1.2  1.2  1.2  1.2  1.2  1.2
Pump inlet ASME B16.5  inch  3  4  6  3  4  8
Pump exhaust ASME B16.5  inch  2.5  3  4 2.5 3  5
Noise level at 1 meter  dB(A) 77  83 85 77  83 85
Vibration severity  mm/sec (RMS)  7  7  7  7  7  7
Pipe connections (Water inlet)  inch  G 1/2 female G 3/4 female G 1 female G 1/2 female G 3/4 female G 1 female
Pipe connections (Water outlet)  inch  G 1/2 female G 3/4 female G 1 female G 1/2 female G 3/4 female G 1 female
Recommended oil (Normal operation)    V-lube F V-lube F  V-lube F V-lube F V-lube F  V-lube F
Oil capacity  litre  20  40 60  30  46  100
Weight (Net)  kg  550  850  1300  650  950  2000
Weight (Shipping)  kg  605  935  1430  715  1045  2200
Dimensions (L x W x H)  mm 660×600×1050  795×680×1330  1000×795×1485  748×645×1135 936×711×1284  1128×975×1584
Cooling water throughput (maximum)  lpm  5  10  20  6.7  13.3 30
Cooling water delta P  bar  2.5  2.5 2.5 2.5 2.5 2.5
Inlet cooling water temperature  ℃  15-30  15-30 15-30  15-30  15-30  15-30
Motor power kW  5.5  11 22  7.5  15 30

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