PED Type Accumulator Bladder

PED-type accumulator bladders refer to the internal rubber bladders (sacs) of hydraulic accumulators that comply with the European Pressure Equipment Directive (PED). These bladder-type accumulators are commonly used to store and release energy in hydraulic systems, and are particularly suitable for the EU and EEA markets.

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Core Definition

A PED-type accumulator bladder is a hydraulic component that complies with the safety standards of the EU PED 2014/68/EU directive. Its main structure consists of a steel outer shell and an internal bladder (sac) made of nitrile rubber (NBR) or other elastomer material. The bladder is filled with pre-pressurized nitrogen and externally with hydraulic oil. It stores energy through the elastic deformation of the bladder.

Key Characteristics

1. High Safety and Compliance: PED-type accumulator bladders must undergo rigorous qualification assessments to ensure safety and reliability in high-pressure operating environments. Products typically bear the CE mark.

2. Structural Forms: Mainly divided into two structural forms: Type A (small-bore) and Type AB (large-bore). Type A is suitable for smaller hydraulic oil pipe diameters, while Type AB is suitable for larger hydraulic oil pipe diameters.

3. Working Medium and Applicable Temperature: Suitable for media such as hydraulic oil, emulsions, and industrial water. The operating temperature range is typically between -20℃ and +93℃.

Application Scenarios

PED-type accumulator bladders are widely used in hydraulic systems, pneumatic systems, energy storage systems, and vehicle suspension systems. They effectively buffer pressure pulsations in hydraulic systems, prevent hydraulic shocks, maintain system pressure balance, and compensate for capacity leaks.

Selection Recommendations

When purchasing a PED-type accumulator bladder, the following parameters should generally be considered:

1. Nominal Volume: From 0.4L to 250L.

2. Nominal Pressure: Commonly available in 10MPa, 20MPa, and 31.5MPa (330bar).

3. Connection Method: Includes threaded connections (NPT, SAE) and flange connections (G, F).

Product
Description

We can design and develop according to the needs of our customers to meet the requirements of different clients.

1. Series Code:

Welded diaphragm accumulators

2. Construction:

A--Rechargeable (M28X1.5)

B--Completely sealed¹

3. Nominal Volume (L)

4. Allowable working pressure (Bar)

5. Shell Material:

1--Carbon steel

6. Diaphragm Material code:

1--Nitrile Butadiene Rubber (NBR)

2--Hydrogenated Nitrile Butadiene Rubber (HNBR)²

3--Isobutylene Isoprene Rubber (IIR)²

7--Epichlorohydrin Rubber (ECO)²

7. Liquid side standard connection AK or AB³

8. Nitrogen pre-charge pressure at 20°C (Bar)¹

Note:

(1) Only for bulk orders of Type A and Type B；

(2) Only for bulk orders;

(3) Non-standard connectors require separate consultation;

Welded Diaphragm accumulator use steel stamping shell, They have two types according to the gas side: Rechargeableand completely sealed.

Product Specifications

Series	Specification	L	R	M1	L1	M2	H	Weight (kg)	50-head product weight (kg)
Euro Standard	E4L	240	73	22-7/8	54	1/2	2.8	0.505
Euro Standard	E5L	310	73		54		2.8	0.56
Euro Standard	E6L	360	73		54		2.8	0.58
Euro Standard	114/1.5L	200	49		54		2	0.34
Euro Standard	114/2.5L	320	49		54		2	0.48
Euro Standard	114/4L	380	49		54		2	0.54
Euro Standard	114/6L	660	49		54		2	0.75
Euro Standard	D12L	410	101		60		3	1.18	2.02
Euro Standard	D15L	457	101		60		3	1.23	2.07
Euro Standard	D20L	612	101		60		3	1.58	2.42
Euro Standard	D24.5L	735-750	101		60		3	1.7	2.54
Euro Standard	D32L	1000	101		60		3	2.5	3.34
Euro Standard	D35L	1060	101		60		3	2.7	3.54
Euro Standard	D40L	1230	101		60		3	2.9	3.74
Euro Standard	D42L	1258	101		60		3	2.9	3.74
Euro Standard	D50L	1538	101		60		3	3.5	4.34
Euro Standard	D53L	1600	101		60		3	3.7	4.54