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Monoflanges and VariAS-Blocks
General Features
Valves acc. to ISO 15848
We can offer the full range of our VariAS-Block Series tested and certified according to ISO 15848-1. These valves are designed to reduce fugitive emissions for environmental protection.

Standard Design

  • Optimized Needle / Stem Seal
  • Special Treated Gland for Long Service Life
  • Glands adapted to Stem Seal
  • Tested and applicable for use up to 200°C (392°F)
  • Production Test according to ISO 15848-2 available on request

Your Benefits

  • Reliability due to Type Testing and Certification by third party inspection
  • Several Stem Seals meet the requirement of ISO 15848-1, Edition 2006. These are more stringent than these of the current Edition 2015.
  • Also Needle Valves are tested and certified according to ISO 15848-1.
  • Graphite Packed VariAS-Blocks according to ISO 15848-1 meet also the requirements for Fire Safe according to ISO10497 / API 607.
  • ISO 15848-1 Valves also comply with the requirements of TA-Luft 2021.
Needle Valves acc. to ISO 15848

Screwed Bonnet
– Type 1 O-Ring Needle Seal + Graphite Packing
   Type 3 PTFE Packing

Features

  • Integral Valve Seat – Metal to metal seated
  • Non-rotating Needle
  • External Stem Thread – Packing below stem threads. Stem threads are protected from process media (non-wetted).
  • Stem with Cold Rolled Threads
  • Blow-out Proof Needle
  • Back Seat – Metal to metal secondary needle seal
  • Lock Pin – Eliminates unauthorized removal of the bonnet
  • Color Coded Dust Cap for operating thread protection
  • Needle Seal: Standard Packing in PTFE or Graphite plus FKM O-Ring Needle Seal – RGD resistant (RGD = Rapid Gas Decompression)
  • Max. allowable (Working) Pressure (PS): 420 bar (6,092 psi)
  • Anti-Tamper Valve Head Options available
  • All Non-wetted Parts in 316 Stainless Steel
  • Types also comply with the requirements of TA-Luft 2021
ISO FE Performance Data

Tightness Class for VariAS-Blocks at Room Temperature (RT) (-29°C to 40°C [-20°F to 104°F])
Double Block & Bleed (Ball / Needle / Ball)

Ball Seat Packing Ball Valve Packing Needle Valve Tightness Class
C01
205 Cycles*		 C02
1,500 Cycles		 C03
2,500 Cycles
Reinforced PTFE or PEEK

 PTFE PTFE / Reinforced PTFE (Type 3) Class A

 Class A Class B
Graphite Graphite / FKM O-Ring (Type 1) Class B
Graphite Graphite (Type 4)
Metal Seated Graphite Graphite / FKM O-Ring (Type 1) Class B

* Several Stem Seals meet the requirement of ISO 15848-1, Edition 2006. These are more stringent than these of the current Edition 2015:
– Tightness values for Class A was reduced by the factor of 10.
– Numbers of mechanical cycles for Class CO1 was reduced from 500 to 205.

Note: The above mentioned table is only valid for Double Block & Bleed Valves (Ball / Needle / Ball). For other types please contact the factory.

Tightness Class for VariAS-Blocks at 200°C (RT to 200°C [-RT to 392°F])
Double Block & Bleed (Ball / Needle / Ball)

Ball Seat Packing Ball Valve Packing Needle Valve Tightness Class
C01
205 Cycles*		 C02
1,500 Cycles		 C03
2,500 Cycles
Reinforced PTFE or PEEK

 PTFE PTFE / Reinforced PTFE (Type 3) Class A


 Class A Class B
Graphite Graphite / FKM O-Ring (Type 1) Class B
Graphite Graphite (Type 4)
Metal Seated Graphite Graphite / FKM O-Ring (Type 1) Class B

* Several Stem Seals meet the requirement of ISO 15848-1, Edition 2006. These are more stringent than these of the current Edition 2015:
– Tightness values for Class A was reduced by the factor of 10.
– Numbers of mechanical cycles for Class CO1 was reduced from 500 to 205.

Note: The above mentioned table is only valid for Double Block & Bleed Valves (Ball / Needle / Ball). For other types please contact the factory.

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