Ashcroft Options - Manual (Page 4)

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Consult factory for guidance in product selection
Phone (203) 378-8281 or visit our web site at
www.ashcroft.com
Consult factory for guidance in product selection
Phone (203) 378-8281 or visit our web site at
www.ashcroft.com
Ashcroft ® Accessories
Protects pressure instruments
against surges and pulsations.
Provides automatic posi-
tive protection and accurate,
repeatable performance.
Automatic pressure shut-off.
Built-in snubber enhances
instrument, protecting
performance.
Type Number Conn. Material Available Ranges (1) Style
100-800 psi L
25-5460 1 ⁄
4
NPTF 303 SS
800-2500 psi M
2500-10,000 psi N
50-5500 1 ⁄
2
NPTF 303 SS 10,000-18,000 psi
O
(1) Use code XFS for factory setting.
CHEMIQUIP PRESSURE LIMITING VALVE (4)
Porosity
Type of Service Designations
High viscous fluids (over 500 S.S.U.) C
Oil (225-500 S.S.U.) D
Water and light oils (30-225 S.S.U.) E
Vapor and low viscosity fluids (Below 30 S.S.U.) F
Air or other gases G
Extreme gas pulsations HX
DIAPHRAGM SEALS
Designed for use with pressure gauges or switches or transmitters on
process applications where:
• Process element materials capable of withstanding corrosive effects
of certain fluids are not available.
• The process fluid being measured would normally clog the pressure
measuring element.
• The process fluid in the measuring element might freeze due to
changes in ambient temperatures.
A diaphragm assembly fabricated of materials that will withstand
various corrosive media encountered, separates the measuring element
from the process fluid. Since the space between the diaphragm and the
measuring element is solidly filled with liquid, any movement of the dia-
phragm caused by a change in the process pressure will be indicated by
the instrument.
Ashcroft diaphragm seals are normally mounted directly to the socket
of an instrument. A flexible stainless steel armored line assembly, is avail-
able for mounting the gauge at some point away from the seal location
to provide easy reading or to limit the temperature at the gauge to 150°F
maximum.
Diaphragm seals (isolators) with filled, capillary line assemblies are
another good solution to the problem of hot liquid and gas lines. Due to
the small diameter of the flexible line (capillary) a five foot line length will
usually assure that the temperature of the gauge connection does not
exceed 150°F. This solution is also superior to a siphon on steam service
where the water filled siphon might freeze.
Assures positive, repeatable
performance of the instrument
by protecting against surges
and pulsations. Automatically
shuts off when overpressure
occurs and is restored when
pressure falls below preset
values.
(2) Specify porosity designation.
(3) Use code XFS for factory setting.
(4) Meets NACE MR01-75 requirements.
CHEMIQUIP PRESSURE LIMITING VALVE SNUBBER
Type NPT
Number Conn.
Material Capacity
25-1098 I 1 ⁄
4
Iron 500 psi @ 400°F
25-1098 B 1 ⁄
4
Brass 250 psi @ 400°F
25-1098 S 1 ⁄
4
ASTM A-106 seamless steel, 338 psi @ 1000° to 3360 psi
Grade A from –20° to 400°F
50-1098 S 1 ⁄
2
ASTM A-106 seamless steel, 333 psi @ 1000°F to 3000 psi
Grade A from –20° to 400°F
50-1098 SD 1 ⁄
2
ASTM A-106 seamless steel, 420 psi @ 1000°F to 3740 psi
Grade A from –20° to 400°F
50-1098 CD 1 ⁄
2
ASTM A-213 seamless steel, 1048 psi @ 1200°F to 9550 psi
Grade T 22 from –20° to 400°F
50-1098 NS 1 ⁄
2
Seamless stainless 294 psi @ 1500°F to
steel, Type 316 3981 psi from –20 to 100°F
50-1098 ND 1 ⁄
2
Seamless stainless 336 psi @ 1500°F
steel, Type 316 5840 psi from –20° to 100°F
25-1100 A 1 ⁄
4
Stainless steel
25-1100 I 1 ⁄
4
Iron – 6 3 ⁄
8
˝ Long
500 psi @ 400°F
25-1100 IL 1 ⁄
4
Iron – 8˝ Long
25-1100 IN 1 ⁄
4
Iron – Angle
25-1100 B 1 ⁄
4
Brass – 5 3 ⁄
8
˝ Long
250 psi @ 400°F
25-1100 BL 1 ⁄
4
Brass – 8˝ Long
condensing hot vapors (not just
steam) are present.
• Pig Tail Siphon–Number 1100
Series, 1 ⁄
4
˝ sizes: to 500 psi and
400°F.
• Coil Pipe Siphon –Number 1098
Series, 1 ⁄
4
,˝ 1 ⁄
2
˝ sizes: to 9550 psi and
400°F.
In order to prevent live steam
from entering a pressure gauge
Bourdon tube, a siphon filled with
water should be installed between
the gauge and the process line. If
freezing of the condensate in the
loop of a siphon is a possibility, a
diaphragm seal should be used to
isolate the gauge from the process
steam. Also use siphons whenever
SIPHONS
Type 1100
Type 1098
Ashcroft ® Accessories
The steel needle valve is an economical, adjustable throttling device for any
severe gauge application. It provides the most practical means for varying the
orifice to determine the exact orifice for any specific service condition. The
valve has an internal seat and is of bar stock construction.
STEEL NEEDLE VALVE
Type Numbers Pressure Ratings
NPT
Lock Bonnet
Material Noncorrosive Service (psi)
Conn. Type Valves 100°F 550°F 850°F 1000°F
Carbon steel
1 ⁄
4
25-7001L with
12-14% chrome
10,000 7735 — —
1 ⁄
2
50-7001L Stainless steel
stem
1 ⁄
4
25-7004L 316 stainless
1 ⁄
2
50-7004L steel
7000 4500 3895 3535
B-Max
C-Max
A Pipe
Conn.
D
E-CLOSED
F-OPEN
Dimension – Inches
A
NPT Conn.
B C D – min. E F Weight oz.
1 ⁄
4
2 1 ⁄
8
7 ⁄
8
2 1 ⁄
2
3 3 1 ⁄
8
8
1 ⁄
2
2 1 ⁄
4
1 1 ⁄
4
2 1 ⁄
2
3 1 ⁄
16
3 3 ⁄
16
21
Type Number Conn. Material Available Ranges
25-255B (1) 1 ⁄
4
NPTF Brass 10-150 psi (2)
25-255S (1) 1 ⁄
4
NPTF 303 SS
150-500 psi
500-1000 psi
50-2550D (3) 1 ⁄
2
NPTF 316 SS 1000-3000 psi