Hydac SB330 Bladder Accumulator
Overview
The Hydac SB330 is a standard bladder accumulator for hydraulic systems. It stores energy by compressing a nitrogen gas charge with pressurized oil, and it releases that energy when the system needs it, which makes it a first choice for energy storage, shock absorption, pulsation damping, leakage loss compensation and volume compensation. The manufacturer describes bladder accumulators as the most versatile and cost-effective option in its range, with the widest choice of standard sizes and very quick response in sizes far larger than diaphragm accumulators can offer.
Seven Star LLC supplies the Hydac SB330 to industrial and oil and gas customers in Oman and the GCC, with engineering support in Muscat. Because an accumulator is a pressure vessel that must be ordered against a precise model code, the Hydac SB330 datasheet information in the SB Series catalog attached to this page is the right starting point for selecting size, port, bladder material and approval, and our team can then confirm the exact order code and availability with you before purchase.
Operating Principle
Inside the Hydac SB330, a rubber bladder separates the gas side from the fluid side. The bladder is pre-charged with nitrogen through the gas valve at the top. When system pressure rises above the pre-charge pressure, oil enters through the fluid port and compresses the gas, storing energy. When pressure falls, the gas expands and pushes the stored oil back into the circuit, supplying peak flow, covering leakage or smoothing pressure peaks. A mechanically actuated poppet valve closes the fluid port when the oil has been expelled, so the bladder cannot be pressed into the port.
The behaviour of the Hydac SB330 depends on the pre-charge pressure, the working pressure range and the effective gas volume, and the catalog quotes effective gas volumes from 66 in³ for the 1 litre size up to 3205 in³ for the 54 litre size. The mounting position of the Hydac SB330 affects usable volume: the manufacturer recommends vertical installation with the fluid port at the bottom for energy storage, and notes that mounting horizontally or at an angle reduces the usable volume. For pulsation damping, constant pressure and volume compensation, any position from vertical to horizontal is acceptable.
Engineering Design of the Hydac SB330
The Hydac SB330 consists of a forged steel shell, a bladder, a gas valve and a fluid port assembly with poppet valve, anti-extrusion ring, seal rings and lock nut. In the standard bottom repairable design the bladder is serviced through the fluid port end, while top repairable versions are available when the bottom connection cannot be removed. The gas valve is the Hydac version 4 (8V1 according to ISO 4570), and the fluid port can be threaded in BSPP, metric, SAE or NPT, or flanged with SAE Code 61 or Code 62 flanges, depending on the order code.
Material choices adapt the Hydac SB330 to the fluid and the environment. Bladder compounds include NBR for mineral oils, LT-NBR and ELT-NBR for low temperatures down to -50 °F, ECO, IIR for phosphate esters and brake fluids, and FPM for chlorinated hydrocarbons. Fluid ports and shells can be carbon steel, stainless steel, coated carbon steel for water service or low-temperature steel, and the model code carries approval options such as ABS and DNV type approval, Canadian CRN registration and PED/CE. The standard Hydac SB330 design is rated to a maximum operating temperature of 200 °F, and other options are considered on request.
Key Features
The Hydac SB330 is a general-purpose accumulator with many configuration options. Main features include:
- Forged steel shell with a closed rubber bladder, available in sizes from 1 to 54 litres in the SB 330 dimension table.
- Mechanically actuated poppet valve that closes the fluid port when the oil has been discharged.
- Standard bottom repairable design, with top repairable, modified flow (396 gpm) and high flow (480 gpm) variants.
- Six bladder compounds from NBR to FPM covering temperatures from -50 °F to 300 °F, depending on the compound.
- Fluid port materials from carbon steel to 316-type stainless steel and coatings for water service.
- Threaded BSPP, metric, SAE and NPT connections and SAE Code 61 and Code 62 flanged options.
- Country and class approval options including PED/CE, CRN, ABS and DNV in the model code.
- Can be mounted in any orientation, with vertical installation recommended for energy storage.
Industrial Applications
The catalog lists agricultural and forestry machinery, oil field and offshore equipment, machine tools, mining machinery, mobile and construction equipment and off-road equipment as typical homes for bladder accumulators. In Oman and the GCC the Hydac SB330 is relevant to hydraulic power units for wellhead and valve control, press and stamping lines at Sohar, crane and lifting systems at Duqm and Salalah ports, and mining and quarry equipment where an accumulator provides emergency energy or absorbs hydraulic shock.
Selection of a Hydac SB330 should always follow the maximum allowable working pressure, pre-charge pressure and discharge volume of the circuit, and local pressure equipment rules must be checked. Related equipment in our catalog includes the Bosch Rexroth R928006678 hydraulic filter element, the LESER Compact Performance safety valves and the Masoneilan Type 87/88 pneumatic spring-diaphragm actuators, which are often considered alongside accumulator stations. Seven Star LLC can help compare the standard SB 330 with the higher-pressure SB 600 series described in the same catalog and can advise on safety blocks, mounting hardware and pre-charge equipment.
Technical Specifications
Key parameters of the Hydac SB330 bladder accumulator taken from the manufacturer SB Series catalog (US edition):
| Parameter | Specification |
|---|---|
| Model | Hydac SB330 standard bladder accumulator (SB 330, standard bottom repairable) |
| Design | Closed rubber bladder inside a forged steel shell with mechanically actuated poppet valve at the fluid port |
| Pressure class | SB 330: 3000 psi typical (maximum allowable working pressure code 210 = 3000 psi); SB 600: 5000 psi typical |
| Nominal sizes (litres) | 1, 4, 6, 10, 20, 32, 42 and 54 (SB 330 dimension table) |
| Design variants | Standard (bottom repairable), N modified flow (396 gpm), H high flow (480 gpm), TR and NTR top repairable |
| Gas valve | HYDAC gas valve version 4 (8V1, ISO 4570) |
| Bladder compounds | NBR, LT-NBR, ELT-NBR, ECO, IIR, FPM (others on request) |
| Bladder temperature ranges | NBR 5 .. 180 °F; LT-NBR -20 .. 180 °F; ELT-NBR -50 .. 220 °F; ECO -40 .. 250 °F; IIR -20 .. 200 °F; FPM 5 .. 300 °F |
| Maximum operating temperature | 200 °F for the standard accumulator design (other options on request) |
| Fluid port materials | Carbon steel, high-strength stainless steel, stainless steel (316 type), coated or chemically plated carbon steel, low-temperature carbon steel |
| Fluid port connections | BSPP (ISO 228), metric (DIN 13), SAE (ANSI B1.1), NPT (ANSI B1.2); flanged SAE Code 61 and Code 62 options |
| Approvals and country codes | S (USA), S1 (Canada, CRN), W1 (ABS type approval), W3 (DNV type approval), U (PED/CE) |
| Mounting position | Any orientation; fluid port at the bottom when installed vertically (energy storage: vertical) |
Dimensions and capacity of the standard bottom repairable Hydac SB330 (3000 psi) as listed in the catalog. The catalog states that dimensions are for general information only and critical dimensions should be verified:
| Nominal size | Effective gas volume | Weight | Length A | Diameter D | Fluid port thread | Q (gpm) |
|---|---|---|---|---|---|---|
| 1 L | 66 in³ (0.29 gal) | 10 lb (4.5 kg) | 12.0 in (303 mm) | 4.5 in (115 mm) | SAE-12 (1 1/16-12 UN) | 60 |
| 4 L | 226 in³ (0.98 gal) | 30 lb (14 kg) | 16.3 in (415 mm) | 6.6 in (168 mm) | SAE-20 (1 5/8-12 UN) | 160 |
| 6 L | 340 in³ (1.47 gal) | 33 lb (15 kg) | 20.5 in (521 mm) | 6.6 in (168 mm) | SAE-20 (1 5/8-12 UN) | 160 |
| 10 L | 566 in³ (2.45 gal) | 86 lb (39 kg) | 22.0 in (559 mm) | 9.1 in (231 mm) | SAE-24 (1 7/8-12 UN) | 240 |
| 20 L | 1125 in³ (4.87 gal) | 140 lb (63 kg) | 34.5 in (876 mm) | 9.1 in (231 mm) | SAE-24 (1 7/8-12 UN) | 240 |
| 32 L | 2080 in³ (9.00 gal) | 226 lb (102 kg) | 54.7 in (1390 mm) | 9.1 in (231 mm) | SAE-24 (1 7/8-12 UN) | 240 |
| 42 L | 2320 in³ (10.04 gal) | 270 lb (123 kg) | 60.2 in (1530 mm) | 9.1 in (231 mm) | SAE-24 (1 7/8-12 UN) | 240 |
| 54 L | 3205 in³ (13.87 gal) | 330 lb (150 kg) | 78.3 in (1990 mm) | 9.1 in (231 mm) | SAE-24 (1 7/8-12 UN) | 240 |
Request a Quote for Hydac SB330
To request a quotation for the Hydac SB330 bladder accumulator, check current availability and lead time or download the manufacturer catalog from the document tab on this page, send the required size, working pressure, fluid, temperature range, port connection and approval to the Seven Star LLC instrumentation team. We supply the Hydac SB330 to customers in Oman and the GCC.
Other Hydac models from Seven Star LLC: Hydac RFM return line filter, Hydac EDS 3400 electronic pressure switch and Hydac ETS 1700 electronic temperature switch.
- Catalog Hydac Bladder Accumulators SB Series Catalog (covers SB330 and SB600) Download
Hydac product families
Hydac groups its program into hydraulics and filtration (filters, accumulators, sensors and measurement), control technology (valves, control blocks, ball valves), thermal management (air and fluid coolers) and drive technology (pumps, motors, cylinders). The four listed products come from the first group and are common on lube oil skids, presses, turbine control units and mobile machines.Ordering Hydac parts: what we need
- Accumulators: full model code, volume, pressure rating, bladder material and the approval required
- Filters and elements: housing code, element code, micron rating and clogging indicator type
- EDS and ETS switches: full code with range, output version and connector
Browse Hydac products by category: Filtration Systems, Pressure Instrumentation.
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