Primary (Roughing) Pump

Product Specifications

Technical details and manufacturing context for Primary (Roughing) Pump

Definition

The primary (roughing) pump is a critical component within a vacuum pumping system responsible for the initial evacuation phase. It removes the bulk of gases from atmospheric pressure down to an intermediate vacuum range (typically 10^-3 to 10^-1 mbar), creating the necessary precondition for high-vacuum pumps to operate effectively. It serves as the first stage in multi-stage vacuum systems. This directory entry covers general specifications for such pumps, including typical pumping speeds of 15–60 m³/h at inlet pressure 1 mbar (ISO 21360), ultimate pressures of 0.5–5 Pa with gas ballast closed (ISO 21360), motor power of 0.75–4 kW for 50/60 Hz operation, voltage range 220–480 V (IEC 60038), frequency 50–60 Hz, operating temperature 5–40 °C, noise level 60–75 dB(A) at 1 m distance (ISO 3744), ingress protection IP54–IP55 (IEC 60529), weight 30–120 kg without oil, oil capacity 0.5–2 L, and inlet connection DN25–DN50 (ISO 1609). Materials commonly used include cast iron, stainless steel, and synthetic elastomers for seals. The working principle involves mechanical displacement of gas, with common types being rotary vane and diaphragm pumps. Selection inputs include required pumping speed, ultimate pressure, motor power, voltage, frequency, operating temperature, noise constraints, ingress protection, weight, oil capacity, and inlet connection size. Interfaces include inlet and exhaust connections, electrical supply, and cooling if applicable. Verification questions should confirm model-specific values and standards with the legal manufacturer or supplier. Maintenance signals include oil level checks, seal wear, and performance degradation. Failure boundaries include operation outside specified temperature or pressure ranges, or exceeding maximum allowable noise or vibration levels.

Working Principle

The primary pump operates by mechanically capturing and expelling gas molecules from the vacuum chamber. Common types include rotary vane pumps, which use rotating vanes to create compression chambers, and diaphragm pumps, which use a flexing diaphragm to create pressure differentials. These mechanisms physically displace gas from the inlet to the exhaust port, reducing the pressure in the chamber from atmospheric to an intermediate level.

Common Materials

Cast Iron, Stainless Steel, Synthetic Elastomers (for seals)

Technical Parameters

Parameter	Typical range	Notes & selection driver
Pumping Speed	15–60 m³/h	At inlet pressure 1 mbarISO 21360
Ultimate Pressure	0.5–5 Pa	With gas ballast closedISO 21360
Motor Power	0.75–4 kW	For 50/60 Hz operation
Voltage	220–480 V	Three-phase, 50/60 HzIEC 60038
Frequency	50–60 Hz	Dual frequency
Operating Temperature	5–40 °C	Ambient, non-condensing
Noise Level	60–75 dB(A)	At 1 m distanceISO 3744
Ingress Protection	IP54–IP55	Motor and controlsIEC 60529
Weight	30–120 kg	Without oil
Oil Capacity	0.5–2 L	For lubrication
Inlet Connection	DN25–DN50 mm	Flange or hoseISO 1609

Ranges are indicative industry figures for RFQ preparation, not a supplier commitment. Confirm every value and standard with the legal manufacturer before ordering.

Components / BOM

Rotor Part
The rotating element that creates the compression chambers for gas displacement.

Material: Steel or Cast Iron
Vanes Part
Sliding blades that seal against the stator wall, creating isolated compression chambers.

Material: Carbon Composite or Reinforced Polymer
Stator Housing Part
The main pump body that contains the rotor and vanes, forming the compression chamber.

Material: Cast Iron or Aluminum
Inlet/Exhaust Valves Part
Check valves that allow gas flow into the compression chamber and prevent backflow from the exhaust.

Material: Stainless Steel
Oil Reservoir Part
Contains lubricating and sealing oil for lubrication, cooling, and sealing internal clearances (for oil-sealed pumps).

Material: Steel
Diaphragm Optional
Flexes to sweep gas through on dry diaphragm pumps, where no oil may touch the process.

Industry Taxonomies & Aliases

Commonly used trade names and technical identifiers for Primary (Roughing) Pump.

Applied To / Applications

This component is essential for the following industrial systems and equipment:

Vacuum Pumping System

View system integration details

Manufacturers of Primary (Roughing) Pump

Manufacturer profiles associated with Primary (Roughing) Pump.

Sourcing Primary (Roughing) Pump from China?

Tell us your specification and target quantity — we will match it against manufacturer records and come back with the factories that fit.

Request manufacturers We manufacture this

Manufacturer listings support early research and capability understanding. They are not certification, ranking, or transaction guarantees.

Procurement Evaluation Criteria

A practical evidence checklist for RFQ preparation and supplier evaluation.

Technical documentation

Request current drawings, revision history, and a signed specification sheet.

Manufacturing capability

Verify equipment lists, process limits, capacity, and representative production evidence.

Inspection readiness

Confirm test methods, calibrated equipment, sampling plans, and traceable reports.

Supplier transparency

Check the legal entity, factory address, ownership, certifications, and direct contacts.

CNFX does not score or rank suppliers. Buyers must verify all claims and documents with the legal manufacturer before ordering.

Frequently Asked Questions

What is the typical pumping speed range for a primary pump?

According to the directory data, typical pumping speed is 15–60 m³/h at an inlet pressure of 1 mbar, as per ISO 21360. However, actual values depend on the specific model and must be confirmed with the manufacturer.

What ultimate pressure can a primary pump achieve?

The directory lists an ultimate pressure range of 0.5–5 Pa with gas ballast closed, per ISO 21360. This is the lowest pressure the pump can reach under ideal conditions; actual performance may vary.

What are common materials used in primary pumps?

Common materials include cast iron, stainless steel, and synthetic elastomers for seals. These materials are chosen for durability and chemical resistance, but specific grades should be verified with the supplier.

What standards apply to primary pumps?

Relevant standards include ISO 21360 for pumping speed and ultimate pressure, IEC 60038 for voltage, ISO 3744 for noise, IEC 60529 for ingress protection, and ISO 1609 for inlet connections. These standards serve as references for verification, not as proof of compliance.

Data Basis

Editorial classification, named public sources where available, and source-reviewed manufacturer records.

Preliminary Technical Classification

This page supports structured research, RFQ preparation, and supplier evaluation. It does not replace buyer-led supplier qualification, standards review, or technical approval.

Buyer enquiry

Request manufacturing insight for Primary (Roughing) Pump

Ask for use case, specification boundaries, supplier type, and RFQ preparation information for this product.

Where it goes: Straight to the CNFX editorial desk, and to the manufacturer if this product is linked to a claimed profile. Nothing is broadcast to a supplier list.
Your details stay here: We do not sell or rent enquiry data, and we do not add you to a mailing list. Used only to answer this request.
No commission, no middleman: CNFX is a directory. We take no cut of any order and never negotiate on a supplier's behalf.
What we don't claim: A listing is not an endorsement. Qualify every supplier and verify every figure yourself before ordering.

pressure:	Atmospheric to 10^-2 mbar
other spec:	Flow Rate: 10-1000 m³/h, Slurry Concentration: Not applicable (dry operation)
temperature:	-20°C to 120°C

Product Specifications

Industry Taxonomies & Aliases

Applied To / Applications

Industrial Ecosystem & Supply Chain Structure

Application Fit & Sizing Matrix

Reliability & Engineering Risk Analysis

Compliance & Manufacturing Standards