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Machine safety is non-negotiable. NorTrade distributes the full Norgren IMI safety-valve range — from inherently fail-safe exhaust valves with dynamic self-monitoring (XSz, SCVA, SCSQ) suitable — in the appropriate application — for EN ISO 13849-1 Performance Level "e" (Category 4), with DGUV approval, through 5/2 safety blocks with integrated proximity-switch diagnostics (NE/138), lockout/tagout valves that support OSHA 29 CFR 1910.147 compliance (CR04), two-hand control units to EN ISO 13851 Class IIIB (XSHC04), and classic pressure-relief safety valves to AD Code A / VdTÜV (4440 series).
Connection sizes G1/4, G3/8, G1/2 (orifice 8 mm, 1-40 bar) or G3/4 (orifice 10 mm, 1-20 bar). Operating pressure 1-40 bar (14.5-580 psi). Fluid/ambient temperature -10..+180 °C. Discharge flow 23.5-571 Nm³/h at set pressure. Weight 0.13-0.33 kg depending on size and response pressure. Compressed air, non-toxic gases.
Operating pressure 3-10 bar (XSz 8), 2-10 bar (XSz 10) or 2-8 bar (XSz 20/32/50). Flow P→A 77-1100 m³/h (exhaust A→R up to 3300 m³/h) depending on size. Filtered ≤50 μm, lubricated or non-lubricated. Ambient -10..+60 °C. Aluminium body, PUR/NBR seals. Fast exhaust for short stopping times.
XSz10: 2-10 bar. XSz10V: 3-10 bar. Flow XSz10: 190 m³/h (P→A); XSz10V: 150 m³/h (P→A). Filtered ≤50 μm, lubricated or non-lubricated. Ambient -10..+55 °C; above +35 °C lubricated air recommended. G1/2 connections. Silencer included. Fast exhaust, spool vertical mount.
Range of sizes DN 8, 10, 20 and 32. 3-10 bar (SCVA08), 2-10 bar (SCVA10/20/32). Flow P→A 1280-7300 l/min, A→R 1550-23 000 l/min depending on size. Filtered ≤50 μm, lubricated or non-lubricated. Ambient -10..+60 °C. Aluminium housing, PUR or NBR seals. Preferably upright with solenoids on top. Not certified for press clutch/brake — see XSz.
G1/2 port, 3.5-10 bar, compressed air filtered ≤50 μm, lubricated or non-lubricated. Ambient -10..+60 °C. Aluminium housing, PUR/NBR seals. Preferably upright with solenoids on top. Not certified for press clutch/brake applications.
ISO 1: G1/4 (1,2,3,4,5) nominal flow 720–1200 l/min, ≈ 1.6 kg. ISO 3: G1/2 (1,2,3,4,5) flow 2330–3615 l/min, ≈ 3.1 kg. Compressed air 40 μm filtered. Ambient -15 … +50 °C. External pilot supply 1.8–16 bar at connection 14. Two SXE valves with position monitoring, two coils, two connectors.
Operating pressure 3–8 bar (44–116 psi). Compressed air filtered to 40 μm. Tube size Ø 4 mm O/D. Ambient -5 … +40 °C. Steel outer cover and end plates, co-polymer buttons, NBR seals. B10: 5 × 10⁶ cycles per ISO 19973.
Operating pressure 0–20 bar (0–290 psi). Port sizes G1/2 / G3/4 / G1 or 1/2" / 3/4" / 1" PTF. Flow 8200–14300 l/min (1→2), 6970–8120 l/min (2→3). Ambient -30 … +80 °C. Optional mounting position. Includes silencer base (zinc), stainless-steel spring detent.
PL (Performance Level) "e" with Category 4 is the highest safety integrity level defined in EN ISO 13849-1 for safety-related parts of control systems. It requires resistance to a single fault AND that accumulation of faults does not lead to loss of safety. XSz (solenoid and air pilot), SCVA, SCSQ and NE/13808/13338 achieve PL "e" Cat. 4 in their primary safety function — built around inherently fail-safe double-valve assemblies with dynamic or proximity-switch self-monitoring.
For the PL "e" Cat. 4 safety function on these valves — no. The dynamic self-monitoring and redundant valve assembly are integral to the valve and remove the need for cyclical monitoring or external evaluation logic for the exhaust function itself — provided the solenoid control signals are supplied in a Category-4-conformant manner. Of course, a safety PLC may still be required for the rest of the machine — but the exhaust function itself is self-contained.
A safety valve (XSz, SCVA, SCSQ) is automatic — it operates during normal production and exhausts the pneumatic system when commanded by the safety circuit or on fault. A lockout valve (CR04) is manual — it lets a maintenance technician physically padlock the air supply in the "off" position, isolating energy for service work per OSHA 29 CFR 1910.147 (lockout/tagout).
A two-hand control (XSHC04) requires the operator to engage both hands simultaneously (within 500 ms) to start a dangerous machine cycle — keeping hands out of the hazard zone. Used on presses, stamping machines and similar where a risk assessment identifies the operator's hand as the barrier between worker and tool; the requirement follows from the machine risk assessment. Standard: EN ISO 13851 Class IIIB.
They solve different problems. The 4440 is a mechanical pressure-relief valve — it opens automatically if upstream pressure exceeds a factory-set value, protecting the equipment (compressor, receiver, vessel) from over-pressure damage. The SCVA is a machine-safety exhaust valve — it depressurises the actuators on command from a safety circuit to protect personnel. Many machines need both.
No. DGUV (Deutsche Gesetzliche Unfallversicherung, formerly BG) is a German workplace-safety institution whose type approval is widely recognised for machine-safety components in Europe. ATEX is the EU directive for equipment used in explosive atmospheres (zones, gas groups, temperature classes). The XSz, SCVA and SCSQ valves have DGUV approvals, but none of the safety valves listed here is ATEX-certified — they must not be used in explosive atmospheres. If you need explosion-proof certification, contact us about Norgren's dedicated ATEX-rated valve ranges.
