- Automation & ControlView all 1,855 products
- AC Drives
- PLC & I/O Cards
- Industrial Communications
- Vibration Monitoring
- Automation Accessories
- Controllers & Data Acquisition
- Isolator & Barrier
- CCTV & Security
- Safety Switches & Guard Locking
- Encoders
- HMI Displays
- Industrial Computers
- Servo Drives
- Motor Soft Starters
- Pneumatic Cylinders
- Machine Vision
- Automation Software
- Robotics
Brand: Flowserve
Flowserve PVXM API 610 OH3 Vertical In-Line Process Pump
Description
Flowserve PVXM API 610 OH3 vertical in-line process pump
The Flowserve PVXM is a vertical in-line diffuser process pump built to API 610 / ISO 13709 type OH3 and BS 4082R. The pump hangs in the pipeline like a valve, so suction and discharge nozzles sit on the same centreline, and the driver sits on top of a rigid motor support head. This takes far less floor space than a horizontal overhung process pump with its baseplate.
Seven Star LLC supplies Flowserve PVXM pumps in Oman and the GCC as an independent supplier in Muscat. A product brochure is attached on this page. The PVXM is a range: size, materials and seal arrangement are chosen from your duty conditions, not from a single order code.
PVXM technical specifications
| Parameter | Specification |
|---|---|
| Manufacturer / part number | Flowserve / PVXM |
| Pump type | Vertical in-line diffuser process pump with bearing housing |
| Standards | API 610 / ISO 13709 (OH3), BS 4082R |
| Flow | Up to 500 m³/h (2200 gpm) |
| Head | Up to 275 m (900 ft) |
| Pressure | Up to 40 bar (600 psi) |
| Temperature | -100 °C to 250 °C (-148 °F to 480 °F) |
| Size range | 1 in to 8 in |
| Flanges | ASME B16.5 Class 300 raised face; ISO and JIS drilling available |
| Seal chamber | API 682 / ISO 21049 |
| Motor mounting | NEMA C-face and IEC motors |
| Materials | API 610 classes S1, S4, S5, S6, S8, C6, A8, D1, D2; NACE MR0103 and MR0175 compliance |
How the PVXM diffuser hydraulics work
Instead of a volute, the PVXM uses a stationary diffuser around the impeller. Diffusers distribute the discharge flow evenly around the full circumference, so radial hydraulic thrust on the shaft is virtually zero at any flow rate. Flowserve states that this gives vibration levels 20 percent lower than API 610 requires, along with lower noise at off-design points.
The diffusers are precision machined and interchangeable, and they can be tuned so the best efficiency point sits exactly on the duty point. The brochure describes minimum continuous flow at 10 to 20 percent of BEP and a continuously rising head curve toward shut-off. Because the casings are shared with the PVML (OH5) and PHL (OH2), a user can change the hydraulics later without altering the installation.
PVXM construction: bearing housing, shaft and motor support head
The OH3 design adds its own bearing housing, so the motor bearings do not carry pump loads. The frame range is limited to two bearing housings and bearing sets, and lubrication can be grease, oil mist or oil cascade for temperatures up to 250 °C. Upper and lower labyrinth bearing isolators are standard, with an option for Inpro-type isolators. A flexible disc spacer coupling and a coupling guard are included.
| Feature | What it provides |
|---|---|
| Stiff shaft | Deflection at the seal faces far below the 0.050 mm (0.002 in) API requirement |
| Motor support head | Tubular, registered fit, no spacer plates; isolates the pump from motor weight |
| Four-side access | Easy inspection and back pull-out without disturbing casing or driver |
| Fan air cooling | Standard for extreme operating temperatures (not needed for oil mist designs) |
| Wear rings | Optional non-metallic rings; TMT and other coatings for abrasive service |
Where the PVXM fits and related pumps
The PVXM complements the horizontal OH2 PHL and the vertical OH5 PVML, which share its hydraulics. For higher pressure or temperature duties than an overhung pump can handle, between-bearings designs such as the HED two-stage BB2 or the DMX multistage BB3 are the usual choices. It is also used with vertical double-casing pumps in the same plants.
Skid builders favour the PVXM because of its compact footprint and the rugged motor support head, which suits modularised construction.
Selection and ordering checklist for the PVXM
- Process liquid, specific gravity, viscosity, vapour pressure and temperature
- Rated flow, differential head and operating range, with 50 or 60 Hz supply
- NPSH available and whether the suction box design is suitable
- Flange rating and drilling (ASME, ISO or JIS)
- API 610 material class, plus any sour-service requirement
- Seal arrangement and plan, single or dual cartridge
- Motor frame (NEMA C-face or IEC), power and speed
- Bearing lubrication method: grease, oil mist or oil cascade
PVXM installation, commissioning and maintenance
Because the pump is supported by the pipework, check the allowable nozzle loads and make sure the line is supported adequately on both sides. Align the motor on its registered fit and verify rotation before coupling. Vent the casing fully and make sure the seal flush is established before start.
Routine work is straightforward thanks to the back pull-out arrangement: the rotating assembly leaves through the side openings of the motor support head, while the casing stays in the line. Keep spare mechanical seals, bearings, wear rings and diffuser-related parts, and quote the nameplate data when ordering.
PVXM applications in Oman and the GCC
The brochure lists petroleum refining, production and distribution, petrochemical and heavy-duty chemical processing, gas industry services, and water and general industry. In the Gulf, that means refinery side streams, condensate and hydrocarbon transfer, amine and chemical service, and offshore or onshore skid packages where plot space is tight.
High ambient temperature and humidity affect motor cooling and lubricant condition, so state the site conditions so that appropriate motor enclosure and bearing lubrication can be recommended.
Information to send with a PVXM RFQ
- Nameplate or process data sheet with flow, head, temperature and liquid
- Pump size, number of units and flange class
- Seal plan and material class
- Motor details or request for a complete package
- Delivery location and timeline
Documents and quotation
A PVXM brochure is attached on this page for reference. Send the model, size and duty data and we will prepare a quotation.
Seven Star LLC is an independent supplier in Muscat and is not the manufacturer; the brochure is a general guide, not a certified drawing.
Other Models in the Flowserve Api Pumps Range
Seven Star LLC supplies models from the Flowserve Api Pumps range in Oman and the GCC. Compare the related models below and request a quote for the one that matches your application.
| Model | Category | |
|---|---|---|
| Flowserve UZDL API 610 BB1 Two-Stage Axially Split Pump | Pumps | View details |
| Flowserve PVXM API 610 OH3 Vertical In-Line Process Pump | Pumps | You are viewing this model |
Datasheets & Documents
- Brochure Flowserve PVXM Pump Brochure Download
Reviews (0)
About brand
Flowserve is the American flow control company for pumps, valves, mechanical seals and valve automation, known through brands such as Durco, Worthington, Byron Jackson, Valtek, Limitorque, Worcester, Logix and Argus. It was formed on 22 July 1997 by the merger of equals of Durco International and BW/IP, whose heritage reaches back to Simpson & Thompson (1790) and Byron Jackson (1872). Flowserve Corporation is headquartered in Irving, Texas, and listed on the New York Stock Exchange.
Seven Star LLC sources and supplies Flowserve pumps, seals, control valves, ball valves, actuators and positioners for process plants in Oman, working from the nameplate data and the manufacturer's documentation.
Flowserve company profile
| Formed | 22 July 1997, merger of Durco International and BW/IP |
|---|---|
| Heritage companies | Simpson & Thompson, later Worthington Simpson (1790); Byron Jackson (1872); Duriron foundry, later Durco (1912) |
| Headquarters | Irving, Texas, USA |
| Ownership | Flowserve Corporation, public company (NYSE: FLS) |
| Product families | API and ANSI process pumps, Durco and Worcester ball and plug valves, Durco TX3 triple-offset and Valtek butterfly and globe control valves, Limitorque electric actuators, Logix positioners, mechanical seals |
Milestones
- 1790: Thomas Simpson founds Simpson & Thompson, a predecessor of Worthington Simpson pumps.
- 1872: Byron Jackson is founded, a root of BW/IP.
- 1912: The Duriron foundry, later Durco, is launched.
- 1997: Durco International and BW/IP merge on 22 July to form Flowserve, listed on the NYSE as FLS.
Flowserve product families listed here
Flowserve pumps on this page are the Durco Mark 3 ANSI process pump and the ECPJ vertical sump pump built to API 610 type VS4. Sealing products are the ISC2 cartridge mechanical seal to API 682 and DuraClear barrier fluid for dual seal systems. Flowserve valves include the Valtek Mark One globe control valve, Argus floating and trunnion-mounted ball valves (EK71, FK79, FK76M) and Durco Microfinish ball valves. Automation is covered by Limitorque MX and L120 multi-turn electric actuators, the Rotadisk RD and RDF pneumatic actuator and the Logix 3800 digital positioner.
Where Flowserve equipment is used
Mark 3 pumps handle acids, caustic, solvents and utilities in chemical and petrochemical units. VS4 sump pumps drain pits and collection tanks. Valtek control valves and Argus ball valves are found in refining, gas processing, power and desalination, and Limitorque actuators operate gate and globe valves on pipelines, tank farms and water networks across the GCC.
Flowserve products we list
Ordering Flowserve parts: what we need
The serial number on the nameplate is the key to Flowserve records for a pump, valve or actuator. Please add the following by product type:
- Pumps: size and model, impeller diameter, materials, seal arrangement, and the part name and item number from the sectional drawing
- Mechanical seals: seal type and size, drawing or part number, materials code, pumped fluid and flush plan
- Valves: size, pressure class, body and trim materials, end connections, and the actuator and positioner model
- Limitorque actuators: unit size, order and serial number, supply voltage, wiring diagram number
Facts checked against Flowserve's SEC filings and published company histories, October 2026.
Browse Flowserve products by category: Control Valves, Pumps, Valve Actuator, Valve Positioner.
FAQ
Questions about the Flowserve PVXM API 610 OH3 Vertical In-Line Process
Answers from our engineering team on installation, compatibility and integration.
01What does OH3 mean for the PVXM?
OH3 is the API 610 / ISO 13709 designation for a vertical in-line, overhung pump with its own bearing housing, mechanically sealed and flexibly coupled to the driver. The PVXM is a diffuser-type pump of this class and meets the standard together with BS 4082R.
02How many hydraulic selections are available?
The PVXM shares hydraulics with the PVML (OH5) and PHL (OH2). Ten casings in the family give a total of about 150 hydraulic combinations, because precision-machined diffuser channels can be customised so the best efficiency point matches your duty.
03What are the published limits?
Flows to 500 m3/h (2200 gpm), heads to 275 m (900 ft), pressures to 40 bar (600 psi). The product page gives temperatures from -100 C to 250 C and sizes from 1 in to 8 in. Flanges are ASME B16.5 Class 300 raised face, with ISO and JIS drilling available.
04Can the pump be serviced without removing it from the line?
Yes. The motor support head is open on four sides and designed for 100 percent back pull-out, so the rotating assembly can be removed without disturbing the casing or the driver. The complete pump can also be removed if needed.
05Which seal chambers does the PVXM use?
An ISO 21049 / API 682 seal chamber, which holds a variety of seal types including single and dual cartridge seals. Dual pressurised and unpressurised cartridge seals support emissions containment for severe services.
Reviews
There are no reviews yet.