Mattei S 900 11V Air Receiver — vertical, 900 L, 11 bar, Rp 1½″/Rp 2″, 200 kg

A problem you have already faced

• The compressor starts more than 10 times per hour — the power contactor burns out, the motor overheats
• Line pressure fluctuates when several consumers start simultaneously — paint defects, automation faults
• Condensate in pipework and equipment because the air has no time to cool before reaching the dryer
• Sourcing an original receiver from the EU takes 4–8 weeks; production is on hold
• No PED/CE documentation — technical inspection and insurers refuse to certify the equipment for operation

A receiver of the wrong capacity or without proper documentation is not a saving — it is a hidden cost: contactor repairs, rejected product and delays in commissioning.

What is the Mattei S 900 11V: model-number breakdown and operating principle

S — Mattei’s vertical receiver series (from Italian Serbatoio — “tank”).

900 — useful volume 900 litres (0.9 m³). Defines the air reserve and the system’s ability to absorb demand peaks.

11 — maximum working pressure 11 bar (PED class). The receiver is proof-tested with the safety margin required by Directive 2014/68/EU.

V — painted finish version (Verniciato). Alternative: Z (Zincato, hot-dip galvanised) for aggressive environments.

Operating principle: the compressor charges the receiver, where pressure builds up. Consumers draw air from the receiver rather than directly from the compressor — this dampens pulsations, reduces motor starts and allows primary condensate separation through cooling within the vessel volume.

Technical specifications — Mattei S 900 11V

💡 Expert tip: The Rp 1½″ inlet and Rp 2″ outlet are non-standard on entry-level receivers. They allow direct connection of DN50 pipework without reducers at compressor outputs up to 6,000 l/min. Confirm your line diameter before installation.

Equivalent products by brand

⚠️ Airpol RV 900/11 uses flanged connections DN50/DN65 instead of threaded Rp — a transition kit is required when substituting. Yakut RV-900/10 is rated at 10 bar: at a system working pressure of 10–10.5 bar there is no pressure margin, and the safety valve may open unexpectedly.

5 parameters to verify when selecting an equivalent receiver:

1. Capacity (L) — must match your calculated requirement within ±10%
2. Maximum working pressure (bar) — the equivalent must not be lower than the compressor discharge pressure + 10% margin
3. Connection type (Rp or DN) — threaded vs. flanged; otherwise adapters are required
4. Pressure vessel standard (PED 2014/68/EU) — required for regulatory commissioning approval
5. Complete supply (safety valve, pressure gauge, drain cock) — a receiver without these fittings cannot legally be put into service

Why Acvatron SRL — 5 compelling reasons

1. Engineering-based capacity selection for your compressor

Before issuing a quotation, an Acvatron engineer calculates the required receiver volume based on your consumption profile, compressor output and the allowable number of starts per hour. You pay for the capacity you need — no more, no less.

2. Full documentation: PED 2014/68/EU, ISO 9001, CE

Every Mattei receiver is shipped with a declaration of conformity under Directive 2014/68/EU and a pressure-vessel data sheet. The complete package for technical inspection, insurance and safety audits — no additional paperwork required.

3. Stock held in Chisinau

Mattei S-series receivers are held in stock. Same-day dispatch on confirmed orders; next business-day delivery within Moldova. Non-standard capacities are available on a lead time of 10–14 working days.

4. 24-month warranty, local service

Mattei receivers carry a 24-month warranty. Safety-valve checks, drain maintenance and scheduled inspections are performed by Acvatron engineers in Chisinau — no need to return the unit to the manufacturer.

5. Authorised Mattei distributor in Moldova

Acvatron SRL is the official Mattei Group distributor in Moldova. Prices are confirmed in the quotation on the day of enquiry with no intermediary mark-ups.

Application areas for the Mattei S 900 11V

Mechanical engineering and metalworking

• Supplying heavy presses and CNC machining centres with peak demand of 800–1,500 l/min
• Air storage for pneumatic vices and clamping fixtures on production lines
• Feeding shot-blast and abrasive-blast equipment

Food processing and packaging

• Air reserve for PET blow-moulding machines (peak demand up to 3,000 l/min)
• Supplying pneumatic conveyors and dosing systems
• Air supply for automated packing and labelling lines

Surface coating and paint finishing

• Steady airflow for spray booths — eliminates pressure fluctuations that affect coating thickness
• Feeding rotary-disc and pneumatic atomisers on conveyor paint lines
• Working in tandem with a refrigerated dryer in the air-treatment chain

Chemical and petrochemical industry

• Pneumatic conveying systems for bulk powder materials
• Actuating process control valves and regulators
• Emergency isolation air supply systems

Expert opinion

Vitali Bolucevschi, Chief Engineer, Acvatron SRL — 15 years in the industry:

The most common mistake when selecting a receiver is focusing solely on compressor capacity while ignoring the consumption profile. A 900-litre receiver paired with a 15 kW compressor in a system with steady demand is oversized. The same receiver with a 22 kW compressor feeding 3–4 simultaneous consumers is the minimum you should consider. The sizing rule: V (L) = Q (L/min) × T_cycle (min) / ΔP (bar). For the Mattei BLADE 7–11 range, 900 L is the factory-calculated optimum. For rotary-vane compressors in the AC series, I recommend this receiver as the right match.

Standards and certifications: PED 2014/68/EU (Pressure Equipment Directive), ISO 9001 (Mattei Group quality management system), CE marking, factory hydraulic proof tests.

How to choose the right receiver capacity: a 5-step process

1. Establish compressor free air delivery (l/min). Mattei BLADE 7 — 900 l/min, BLADE 11 — 1,400 l/min. Refer to the compressor data sheet.
2. Determine the allowable number of motor starts per hour. For fixed-speed compressors the accepted limit is 6–8 starts/hour. Every start above this limit accelerates contactor and winding wear.
3. Apply the sizing formula. V (L) = Q (l/min) × T_cycle (min) / ΔP (bar). At Q=900, T=1 min, ΔP=1 bar → V=900 L — exact match with the S 900.
4. Check system working pressure. Compressor discharge pressure must not exceed 11 bar. For 13–16 bar systems, specify the S 900 16 variant.
5. Select the appropriate surface finish. V (painted) — standard compressor rooms; Z (galvanised) — humid locations, outdoor installation, corrosive environments.

Handling common objections

“I can find a cheaper receiver without certification”

A receiver without a PED 2014/68/EU declaration of conformity is a pressure vessel without a licence to operate. In the event of an incident, the insurer will decline the claim and the technical inspectorate will issue a production-stop order. The price difference between an uncertified unit and a certified Mattei is recovered from a single insurance event.

“The capacity I need is not in stock”

Mattei manufactures vertical receivers in capacities of 500, 720, 900, 1,000, 1,500, 2,000, 3,000, 4,000 and 5,000 litres. Non-standard sizes are available on a lead time of 10–14 working days. The S 900 11V is held in Acvatron’s Chisinau warehouse.

“I am not sure whether I need 900 litres or less”

Contact Acvatron — our engineer will size the receiver in 15 minutes using your compressor data and consumer count. There is no need to pay for 400 extra litres you do not require, but equally, cutting corners on the reserve that protects your motor from excessive cycling is a false economy.

Frequently asked questions

❓ Does the standard supply include the safety valve, gauge and drain?

Yes. The Mattei S 900 11V is shipped fully fitted: a certified safety valve (set at 11 bar), a pressure gauge and a manual condensate drain cock. An automatic electronic drain can be added as an option — recommended for compressor rooms running continuous shifts.

❓ Can multiple receivers be connected in one system?

Yes. Receivers can be connected in parallel (to add volume) or in series (for staged drying and storage). Two S 900 units in parallel give 1,800 L of total volume — the equivalent of an S 2000 but with easier transport logistics. Confirm the piping scheme with an Acvatron engineer.

❓ How often should condensate be drained?

With a manual drain: at the end of every shift. In intensive operation (more than 8 hours per day) or high ambient humidity: twice per shift. We recommend fitting an automatic electronic drain to eliminate water build-up and reduce the risk of corrosion in the lower shell.

❓ What maintenance does the S 900 11V require?

Monthly: function test of the safety valve (manual lift of the spindle). Quarterly: visual inspection of the shell for corrosion and mechanical damage. Annually: hydraulic pressure test at 1.5 × MAWP = 16.5 bar per PED regulations. First statutory inspection — 4 years from the date of manufacture.

Take the next step right now

1. 📞 Call or message us on WhatsApp/Viber — an Acvatron SRL engineer will size the receiver and confirm S 900 11V stock availability on the day of your enquiry.
2. 📋 Receive a commercial quotation with price, delivery time and the full technical documentation package (PED, CE, data sheet).
3. 🛒 Place your order — same-day dispatch from our Chisinau warehouse upon payment confirmation; next business-day delivery within Moldova.

Acvatron SRL — an engineering approach to every sale.