Description

The EPE range of safety blocks BS is available in sizes NG10, NG20, NG25 and NG32. The safety blocks BS combine all the features to pro- tect, isolate and discharge a hydraulic accumulator. The shut-off valve rotates of 90 degrees to instantly isolate the accumulator from the hy- draulic system in emergency conditions or for maintenance. Once iso- lated, the accumulator can be discharged into a tank through a discharging valve with manual or electric controls. In version BS10 and BS20 when switching over the ball valve, the pump flow rate is stopped and simultaneously the accumulator discharged to the tank. During swit- ching all three ports (P, A and T) are momentarily interconnected (nega- tive switching overlap). Ball valves are not designed to be used as flow control valves; therefore they should always be either fully open or fully closed, to avoid damaging the sealing cups. The system security is en- sured by a pressure PED an anti-tempering pressure valve certified CE/PED. The safety blocks BS allow easy and secure connection of an accumulator to a hydraulic system. Suitable for use with all types of blad- der, piston and diaphragm accumulators, the compact and multifunction design allows saving space and reducing the wiring. By reducing the times required by the procedures of installation and maintenance, the security blocks BS help maximizing the productivity and profitability, mi- nimizing the downtime of the system. For easy installation, we offer a full range of adapters, suitable for all standard fittings of any size and type. For diagnostic purposes and for continuous monitoring of pressure, all the security blocks BS are provided with a manometer connection of 1/4″BSP. The European Directive on pressure equipment 97/23/EC sta- tes that all accumulators must be provided with a safety device that in- tercepts, limit and discharge the pressure as well as allows carrying out the measurements. BS range satisfies all these requirements with a sin- gle and compact device. The safety block should always be mounted as close as possible to the accumulator.

Technical data

MAX OPERATING PRESSURE (PS): 420 bar
PRESSURE TEST (PT): 1.43 x PS
NOMINAL PASSAGE DIAMETER: 10mm, 20mm, 25mm, 32mm

WORKING TEMPERATURE: -40 ÷ +150
FLUID VISCOSITY RANGE: 10 ÷ 400 cSt
RECOMMENDED VISCOSITY: 36 cSt
FLUID CONTAMINATION DEGREE: class 21/19/16 according to ISO 4406/99

SHUT-OFF VALVE: ball type
SAFETY VALVE: with DBDS 10 cartridge
DISCHARGE VALVE: manual and electric
MOUNTING POSITION: every position

BODY MATERIAL: – phosphated or galvanized carbon steel
in compliance with Directive 2002/95/EC (RoHS) to re-

sist to corrosion.
– nickel coating 25 – 40 μ
– stainless steel AISI 430 (only for BS25)

VALVES MATERIAL: – phosphated or galvanized carbon steel in com- pliance with Directive 2002/95/EC (RoHS) to resist to

corrosion
– stainless steel

SEALS MATERIAL:

P = Nitrile rubber (NBR)
F = Low temp. nitrile rubber
K = Hydrogenated nitrile (HNBR) – E = Ethylene-propylene (EPDM) – V = Fluorocarbon (FKM)

See Table 9.3B and/or section 1.5

ACCUMULATOR SIDE CONNECTION:

– 3/4″ BSP with O-Ring for chamfer – 1”1/4 BSP with O-Ring for chamfer – 2” BSP with O-Ring for chamfer

FLUID PORT CONNECTION: see Chapter 9.3.8
FLOW RATE: see Chapter 9.3.10
POWER SUPPLY: 24 VDC, 105 VDC, 110 VDC, 220 VDC, P=26W, 100%ED, IP65 in compliance with DIN 40050, connector in compliance with DIN 43650 type A 2 poles + earthling with AC voltage; the internal connector has a bridge rectifier
WEIGHT: see Chapter 9.3.8