QS&Y Bolted 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
- Spring Washers for compensation of thermal expansion
- Back Seat – Metal to metal secondary stem seal
- Color Coded Dust Cap for operating thread protection
- Needle Seal: Standard Packing in PTFE or Graphite plus FKM O-Ring Needle Seal - RGD resistant
- Bonnet Seal Ring: Graphite
- Fire Safe approved acc. to ISO 10497 and API 607; Graphite Packing only
- 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
ISO FE Type 1:
Class A 2,500 cycles / –29°C to 40°C
(–20°F to 104°F)
Class A 500 cycles / –29°C to 200°C
(–20°F to 392°F)
Class B 2,500 cycles / –29°C to 200°C
(–20°F to 392°F)
ISO FE Type 3:
Class B 2,500 cycles / –29°C to 200°C
(–20°F to 392°F)
