Jessberger JP-810.20 Air-Operated Diaphragm Pump 3/8" 20 l/min — ATEX Zone 2

The JP-810.20 is the only model in the JP-810 series available with POM housing — making it the first choice when food contact compliance, low extractables or compatibility with fuels, oils and alcohols requires more than PP. At 20 l/min and 3/8" BSP connections, it handles small-to-medium transfer volumes with precise flow control. Four housing materials are available: PP, POM, PVDF and AISI 316, covering dilute process chemicals through to concentrated acids and pharmaceutical-grade media.

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-810.20 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 2.5 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-810.20 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. POM (polyoxymethylene) offers good resistance to fuels, oils, hydrocarbons and alcohols where PP is not suitable — the standard configuration uses an NBR/PTFE diaphragm with PTFE balls and POM seats. AISI 316 stainless steel covers highly corrosive aqueous media, strong acids and alkalis, and process fluids in pharmaceutical and fine chemical applications — 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.

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 2.5 mm — ball-check valve design tolerates particulate 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, POM, 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: 6 mm
• Max. air pressure: 7 bar
• Fluid connection: 3/8" BSP
• Max. flow rate: 20 l/min
• Max. delivery head: 70 m
• Suction lift (dry): 5 m
• Suction lift (wet): 9.8 m
• Max. solid passing: 2.5 mm
• Max. viscosity: 10,000 mPas
• Stroke volume: 30 cm³
• Noise level: 65 dB (at max. air pressure)
• Housing materials: PP, POM, PVDF, AISI 316

Typical media by housing

• PP: dilute acids, alkalis, detergents, aqueous chemical solutions, water treatment chemicals
• PVDF: concentrated acids, oxidising agents, halogenated solvents, aggressive cleaning agents
• POM: fuels, oils, hydrocarbons, alcohols, non-aggressive solvents
• AISI 316: highly corrosive acids and alkalis, aggressive aqueous media, pharmaceutical and fine chemical process fluids

Applications

• Food-grade liquid transfer — oils, syrups and process fluids — POM or AISI 316 housing
• Pharmaceutical process dosing and small-volume filling in ATEX Zone 2 environments
• Transfer of fuels, oils, alcohols and non-aggressive solvents — POM housing
• Dosing of inks, adhesives and coatings from small containers
• Small-volume chemical transfer from 20–200L drums in laboratory and pilot-plant settings
• Water treatment chemical dosing where precise, low-flow control is required

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 7 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-810.8 — ¼" BSP, 7 l/min
• Next size up: JP-810.35 — ½" BSP, 35 l/min