Jessberger JP-810.252 Air-Operated Diaphragm Pump 1¼" 250 l/min — ATEX Zone 2

The JP-810.252 is the PP/PVDF/AISI316 variant of the 1¼" 250 l/min platform — chosen for high-throughput transfer of aggressive aqueous chemicals, acids, alkalis and halogenated solvents where the ALU housing of the JP-810.250 is incompatible with the medium. Stroke volume, solid passing and viscosity ceiling match the ALU model; the larger 1¼" bore lifts flow above what the 1" JP-810.171 series can deliver. Where ALU housing is required at the same flow rate, see the JP-810.250.

Purpose

The AODD operating principle means compressed air alternates between two chambers, driving a pair of flexible diaphragms back and forth. No electric motor contacts the fluid zone — making the JP-810.252 inherently safe for flammable and explosive media classified for ATEX Zone 2. The pump is fully self-priming, can run dry without damage and handles media containing suspended solids up to 7.5 mm. For applications involving high-viscosity media that require pre-heating before transfer, the pump pairs well with a HeatXperts drum heater to reduce viscosity to pumpable levels. Where stricter Zone 1 certification is required, the JP-810.252 Conductive version with carbon-filled housing is available as a separate product.

Selecting your housing

Housing selection determines chemical compatibility and dictates the standard internal configuration. PP is the all-round choice for acids, alkalis and most aqueous media — the standard configuration pairs a Hytrel diaphragm with PTFE balls and PP seats. PVDF handles highly aggressive media including strong oxidising acids and halogenated solvents that would compromise PP — the standard configuration uses a Santoprene/PTFE composite diaphragm with PTFE balls and PVDF seats. AISI 316 stainless steel covers highly corrosive aqueous media, strong acids and alkalis that attack polymer housings, and food or pharmaceutical process fluids — the standard configuration pairs a Hytrel/PTFE composite diaphragm with PTFE balls and stainless steel seats. Contact us for configuration advice specific to your medium and operating conditions. For solvent, fuel and hydrocarbon applications requiring ALU housing at the same flow rate, see the JP-810.250.

Key features

• AODD operating principle — no electrical components in the fluid path, inherently safe for flammable media
• Dry-running capable — no mechanical seal, no damage if air supply continues with empty chamber
• Self-priming — pulls liquid from 5 m dry or 9.8 m wet suction lift without manual priming
• Passes solids to 7.5 mm — large-bore ball-check design handles heavily loaded or slurry media
• Adjustable flow and delivery head via inlet air pressure — no frequency inverter required
• Non-lubricated air operation — no oil separator required in the air supply line
• Separable manifold — allows two different media to be pumped simultaneously
• Easy field maintenance — modular design, standardised spare parts kit available
• Available in PP, PVDF and AISI 316 housing — matched diaphragm and seal configuration per material

Certification & Approvals

• ATEX Zone 2 gas: II 3/3 G Ex h IIC T4 Gb
• ATEX Zone 2 dust: II 3 D Ex h IIIB T 135°C Db X
• CE marked

Technical Specifications

• Drive: compressed air (non-lubricated)
• Air connection: ½" BSP
• Max. air pressure: 8 bar
• Fluid connection: 1¼" BSP
• Max. flow rate: 250 l/min
• Max. delivery head: 80 m
• Suction lift (dry): 5 m
• Suction lift (wet): 9.8 m
• Max. solid passing: 7.5 mm
• Max. viscosity: 35,000 mPas
• Stroke volume: 700 cm³
• Noise level: 75 dB (at max. air pressure)
• Housing materials: PP, PVDF, AISI 316

Typical media by housing

• PP: dilute and concentrated acids, alkalis, detergents, aqueous chemical solutions, water treatment chemicals
• PVDF: concentrated oxidising acids, halogenated solvents, aggressive cleaning agents, media incompatible with PP
• AISI 316: highly corrosive acids and alkalis, aggressive aqueous media, food and pharmaceutical process fluids

Applications

• High-throughput transfer of aggressive aqueous chemicals from bulk tanks where 1" connections limit flow rate
• Large-scale dosing and process supply in chemical and pharmaceutical manufacturing at 1¼" pipework
• Transfer of concentrated acids and oxidising agents at production rate — PVDF housing
• Food and pharmaceutical process fluid transfer — AISI 316 housing for hygienic applications
• Slurry and suspended-solids handling at high flow — 7.5 mm passing diameter, PP or SS housing
• Water treatment — high-flow dosing of concentrated process chemicals and coagulants

Operational Requirements

• Air supply must be clean, dry and non-lubricated — do not use lubricated air (damages internal seals)
• Inlet air pressure must not exceed 8 bar — operating above rated pressure reduces diaphragm life
• Can be run dry without damage — no minimum flow requirement
• Ensure fluid connection piping is adequately supported — do not use the pump housing as a pipe anchor
• If the pump is stalled (air on, no flow), the diaphragm is under constant load — avoid prolonged stall conditions
• Verify chemical compatibility for the specific medium and temperature before commissioning
• Note: the PVDF product image shows the Conductive (black) version — the Standard PVDF pump is supplied in grey housing.

JP-810 Series — Other Sizes

• One size smaller: JP-810.171 — 1" BSP, 170 l/min, PP/PVDF
• Same flow, ALU housing: JP-810.250 — 1¼" BSP, 250 l/min, ALU
• Next size up: JP-810.400 — 1½" BSP, 380 l/min, PP/PVDF/ALU/SS