- AC Drives
- Industrial Communications
- PLC & I/O Cards
- Vibration Monitoring
- Automation Accessories
- Controllers & Data Acquisition
- CCTV & Security
- Safety Switches & Guard Locking
- Encoders
- Industrial Computers
- Servo Drives
- Motor Soft Starters
- HMI Displays
- Pneumatic Cylinders
- Isolator & Barrier
- Automation Software
- Machine Vision
- Robotics
Pumps
Positive Displacement Pumps
Positive displacement pumps deliver a fixed volume per revolution or stroke, so they handle viscous, shear-sensitive and solids-laden fluids and hold flow steady against changing pressure. Seven Star LLC, an independent supplier in Muscat, supplies positive displacement pumps from NETZSCH, KRACHT, Allweiler, Debem, Verder and Tapflo to industry in Oman and the GCC.
Read the full category guide- 37 products
- 6 brands
Category guide
About Positive Displacement Pumps
Positive displacement pumps deliver a fixed volume per revolution or stroke, so they handle viscous, shear-sensitive and solids-laden fluids and hold flow steady against changing pressure. Seven Star LLC, an independent supplier in Muscat, supplies positive displacement pumps from NETZSCH, KRACHT, Allweiler, Debem, Verder and Tapflo to industry in Oman and the GCC.
Types of positive displacement pump in this category
Progressing cavity pumps such as the NETZSCH NEMO and Allweiler OptiFix move sludge, slurries and viscous products. Screw pumps like the NETZSCH NOTOS 2NS, 3NS and 4NS and the Allweiler SN and TRILUB series serve fuel oil, lube oil and transfer duties. KRACHT gear pumps, including the KF stainless process pump and DuroTec for abrasive fluids, handle oils and chemicals. Air-operated double diaphragm pumps from Debem, Tapflo and Verder, with pulsation dampers, transfer chemicals, paints and wastewater without electricity at the pump.
How to select a positive displacement pump
Define flow, discharge pressure, viscosity range, temperature and solids content. Choose the pump principle for the fluid: gear and screw pumps for clean lubricating fluids, progressing cavity for sludge and shear-sensitive products, diaphragm pumps for chemicals and intermittent duty. Then select materials, seals or diaphragm elastomers, drive and relief protection.
Data needed for a quotation
Send the pump model, or flow, pressure, fluid, viscosity, temperature, materials, drive data and quantity.
What to include in your inquiry
These details let us quote the right item the first time.
- Fluid pumped and its temperature
- Flow rate and head
- Material of construction
- Motor power supply
- Model and serial number, for spare parts
- Hazardous-area requirement, if any
Missing some of them? Send what you have. A nameplate photo or an old part number is enough to start.
Brands in Positive Displacement Pumps
All brands →
Related categories
Most viewed in Positive Displacement Pumps
Request a Quote for Positive Displacement Pumps
Looking for a specific model, part number or brand in Positive Displacement Pumps? Send us your requirements and quantities. Seven Star LLC sources genuine industrial equipment for customers across Oman and the GCC and replies with a formal quotation.
- Genuine OEM products
- Supply across Oman & the GCC
- Formal quotation from our sales team
Free, no-obligation quotation · takes about 1 minute
Other enquiries: [email protected] · WhatsApp
Frequently Asked Questions
When is a positive displacement pump better than a centrifugal pump?
For viscous fluids, high pressure at low flow, accurate dosing or when flow must stay constant regardless of pressure.
Why does a positive displacement pump need a relief valve?
It keeps pushing fluid against a closed outlet, so pressure can rise until something fails. A relief valve or bypass protects the system.
What are air-operated diaphragm pumps used for?
Transfer of chemicals, solvents, paints and slurries. They run dry, self-prime and need only compressed air.
Which pump suits sludge?
Progressing cavity pumps handle sludge, slurries and pastes with low shear and steady flow.
What should I send for a quotation?
The model, or flow, pressure, fluid, viscosity, temperature, materials, drive and quantity.