Tesco® Brand valve has been used in the most aggressive and corrosive applications like hydrofluoric acid, sulfuric acid, 35% hydrochloric acid, nitric acid, chlorine gas (wet or dry), vinyl chloride monomer, ethylene di chloride, chlorinated caustic soda, chlorine dioxide, bleached stock and sodium chlorate among others; as well as ultra-pure applications such as 18 Mega OHM de-ionized water and ultra-pure HF acid.
It FEP/PFA/PTFE/PVDF/PP FEP lined valve for aggressive chemical and ultra-pure applications. FEP resists chemical attack from most known chemical compounds, and with a flexible liner design utilizing a full width, 360º degree, resilient back up liner offers bubble tight shut off in even the most demanding installations. Redundant shaft seals (which include a spring energized safety packing) provide a tight, reliable seal to the environment.This is a “maintenance free” valve design which uses long life sleeve bearings And avoids the use of an adjustable packing gland.
Valve is rated up to 150 psig and down to 0.0002 psia (full vacuum). It is available in either a ductile iron wafer or ductile iron lug body. Standard FEP/ PFA material is DuPont grade with available for ultra-pure applications.
Advantages of theTesco® Brand valve are numerous, and include:
Bubble tight shut off
Lug bodies rated at full pressure AND bubble tight shut off, even with the downstream flange removed
Non-wetted (dry) shafts
Three levels of shaft sealing including a spring energized safety seal
Maintenance free design and materials
High cycle life
High flow rates
All valves (100%) factory leakage tested
Direct mount capability with AMRI actuators
Technical Specifications
1.
Construction type
:
Design Butterfly valve with FEP/PFA/PTFE lined body
2.
Manufacturing (Design) standers
:
API-609/BS 5155
3.
Body type & end connection
:
Short wafer, 2 piece body
4.
Seat type
:
FEP/PFA/PTFE with Silicon backup ring
5.
Size range
:
50 NB to 300 NB
6.
Pressure rating
:
PN 10 (max)
7.
Operating temperature range
:
-25° C to 200° C (depending on MOC)
8.
Seat leakage
:
Tight shut off (better than class VI as per ANSI/FCI 70-2)
9.
Operation
:
Handlever for sizes unto 200 NB,
Worm gear boxes for 50 NB to 300 NB,
Pneumatic / Electric actuator operation - optional.
10.
Standard Material of Construction (MOC)
Body
:
C.I/SGI/WCB/CF8/CF8M
Disc
:
CF8/CF8M/Other special alloys
Seat
:
FEP/PFA/PTFE
Shaft
:
AISI 410 / SS 304 / 316 SH
Lining thickness
:
3.5 to 4.0 mm
Features & Benefits
FEP/PFA lined disc & stem
Actuated by electric or pneumatic actuators
Ideal for corrosives
Reliable for vacuum services
Compact assembly
Large bearing surfaces
Excellent seal/barrier against leakage to atmosphere
