Description Size 25 Component series 5X Maximum operating pressure 315 bar Maximum flow 450 l/min Features Sandwich plate valve for use in vertical stackings Porting pattern according to ISO 4401-08-08-0-05 For the leakage-free blocking of one or two actuator ports, optional Various cracking pressures Pre-opening standard Check valve installation sets available individually Special versions on request Product description The isolator valve type Z2S is a releasable check valve in sandwich plate design. It is used for the leakage-free blocking of one or two actuator ports, also in case of longer standstill times. In direction A① to A② or B① to B②, there is a free flow; in the opposite direction, the flow is blocked. If, for example, there is a flow through the valve in direction A① to A②, the control spool (1) is moved in the direction of the B side, opens the ball seat valve (2) and then pushes the poppet (3) off its seat. Hydraulic fluid can now flow from B➁ to B➀. In order to allow the ball seat valve (2) to be safely closed, the control spool (1) must be hydraulically unloaded (see circuit example). Pre-opening Due to the pre-opening, there is a damped decompression of the pressurized liquid. Thus, possible switching shocks are avoided. The two-stage set-up with an increased control open ratio means even low pilot pressure can be unloaded securely. Type Z2S 22 ‒… Type Z2S 22 A… Type Z2S 22 ‒…SO40 Type Z2S 22 A…SO60 Circuit example, schematic 1 Control spool, area A 2 2 Ball, area A 3 3 Poppet, area A 1 4 Stop 5 Control spool, area A 4 ① component side ② plate side Type code 01 02 03 04 05 06 07 08 09 Z2S 22 – 5X / * 01 Check valve, Sandwich plate design Z2S 02 Size 25 22 Leakage-free blocking 03 Channel A and B – Channel A A Channel B B Cracking pressure 04 3 bar 1 5 bar 2 7,5 bar 3 10 bar 4 05 Component series 50 ... 59 (50 ... 59: unchanged technical data and pin assignment) 5X 06 Surface without corrosion resistance 1) no code Seal material 07 NBR seals no code FKM seals V Observe compatibility of seals with hydraulic fluid used. Special version 08 Without no code Control open by external port G1/4 (only version "A" and "B") SO40 Control spool unloaded to port T SO60 09 Further details in the plain text * 1) Corrosion-resistant surface on request: e.g. "J50" thick film passivated (DIN 50979 Fe//Zn8//Cn//To) Technical data general Size 25 Weight kg 12 Installation position any Ambient temperature range NBR seals °C -30 … +80 FKM seals °C -20 … +80 hydraulic Size 25 Maximum operating pressure bar 315 Cracking pressure (in free direction) 3 / 5 / 7.5 / 10 bar Maximum flow l/min 450 Direction of flow see symbols Hydraulic fluid see table "Hydraulic fluid" Hydraulic fluid temperature range NBR seals °C -30 … +80 FKM seals °C -20 … +80 Viscosity range mm²/s 2.8 … 500 Maximum admissible degree of contamination of the hydraulic fluid, cleanliness class according to ISO 4406 (c) 1) Class 20/18/15 Area ratio With pre-opening A 3/ A 2 ~ 1/12.5 (see sec
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