Screw-in cartridges and line mount bodies - Wandfluh - #49

IS 7789

Direct operated pressure relief valve as screw-in cartridge with a thread M18x1,5 and cavity according to IS draft 7789. The valve is available in three different setting versions Key setting "S" and turning nob setting "D", both with arrest device, as well as in a loc able version "K". Key ad ustment "S" is also available with cover, see data sheet 2.0-50. Three standard pressure levels are available 63, 160 and 315 bar. The cartridge body made of steel is galvani-ed and therefore rust-protected. The aluminium turning nob, color-less anodised, gives this quality product a clean design.

hen the set operating pressure is reached, the poppet spool opens and connects the protected line with the return line to the tan . By means of the ad usting mechanism the poppet spool is pressed onto a hardened seat which is pressed into the lower cartridge opening by a helical spring. Than s to the poppet/spool principle and the direct operation, these pressure reliefe valves are rapid acting and free fo lea age oil. Therefore they are suitable wherever no lea age must occur in the system and where short opening times are demanded.

For limiting the operating pressure in hydraulic systems by releasing the oil from the protected oil line P 1 to the outlet/tan return line T 2 . The screw-in cartridge is very suitable for mounting in control bloc s and is built into the andfluh miniature hydraulics NG3 as a functional element in sandwich style plates vertical combination and flange-mounted valves please refer to the separate data sheets in register 2.1 . Stepped tools are available for ma ing the receptacle bores in steel and aluminium ire or purchase . Please refer to the data sheets in register 2.13. Attention Should therefore not be utili ed anymore in applications with periodically changing direction of flow.

B S □ PM18 -

GENERAL SPECIFICATI NS ....................1

YDRAULIC SPECIFICATI NS.................1

SYMB L......................................................1

MEC ANICAL ACTUATI N........................1

C ARACTERISTICS...................................2

DIMENSI NS..............................................2

PARTS LIST................................................2

ACCESS RIES...........................................2

Pressure relief valve

Direct operated, poppet spool

Types of ad ustment Key S

Control nob D Loc K

Cover A see data sheet 2.0-50

Screw-in cartridge M18x1,5

Pressure range

Pn 63 bar Pn 160 bar Pn 315 bar

63 160 315

Design-Index Subect to change

Description

Construction

Mounting

Ambient temperature Mountimg position Fastening eight

Direct operated pressure relief valve Screw-cartridge for cavity acc. to IS 7789 Screw thread M18x1,5

-20 50 C

any

M_D 30 Nm

m 0,11 g ey

m 0,12 g control nob

m 0,22 g loc

ydraulic fluid Contamination efficiency

Mineral oils, other fluids on request IS 4406 1999, class 18/16/13 Required filtration grade 6 10>75 refer to data sheet 1.0-50/2 12 mm²/s 320 mm²/s -20 70 C

^pmax ^{400 bar p}Tmax ^pp ^{80 bar}

p_N 63 bar, p_N 160 bar, p_N 315 bar see characteristics Q 0,1 5 l/min Maximum 4 drops/min

up to 80 of the ad usted pressure

Viscosity range Fluid temperature Pea pressure

Nominal pressure range Minimum pressure Volume flow Lea age volume flow

Mechanical types of operation in 3 different versions

S Key ad ustment by means of Allen ey

and screw driver D Control nob ad ustment, fixed

K Loc ad ustment

Actuation stro e S_b

b

Actuation angle a_b

5 mm

1800 5 revolutions