Ashcroft Options Manuel d'utilisateur télécharger pdf (Page 4)

263262

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

⁄4 NPTF 303 SS

800-2500 psi M

2500-10,000 psi N

50-5500

⁄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

⁄4 Iron 500 psi @ 400°F

25-1098 B

⁄4 Brass 250 psi @ 400°F

25-1098 S

⁄4

ASTM A-106 seamless steel, 338 psi @ 1000° to 3360 psi

Grade A from –20° to 400°F

50-1098 S

⁄2

ASTM A-106 seamless steel, 333 psi @ 1000°F to 3000 psi

Grade A from –20° to 400°F

50-1098 SD

⁄2

ASTM A-106 seamless steel, 420 psi @ 1000°F to 3740 psi

Grade A from –20° to 400°F

50-1098 CD

⁄2

ASTM A-213 seamless steel, 1048 psi @ 1200°F to 9550 psi

Grade T 22 from –20° to 400°F

50-1098 NS

⁄2

Seamless stainless 294 psi @ 1500°F to

steel, Type 316 3981 psi from –20 to 100°F

50-1098 ND

⁄2

Seamless stainless 336 psi @ 1500°F

steel, Type 316 5840 psi from –20° to 100°F

25-1100 A

⁄4 Stainless steel

25-1100 I

⁄4 Iron – 6

⁄8˝ Long

500 psi @ 400°F

25-1100 IL

⁄4 Iron – 8˝ Long

25-1100 IN

⁄4 Iron – Angle

25-1100 B

⁄4 Brass – 5

⁄8˝ Long

250 psi @ 400°F

25-1100 BL

⁄4 Brass – 8˝ Long

condensing hot vapors (not just

steam) are present.

• Pig Tail Siphon–Number 1100

Series,

⁄4˝ sizes: to 500 psi and

400°F.

• Coil Pipe Siphon –Number 1098

Series,

⁄4,˝

⁄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

⁄4 25-7001L with

12-14% chrome

10,000 7735 — —

⁄2 50-7001L Stainless steel

stem

⁄4 25-7004L

316 stainless

⁄2 50-7004L

steel

7000 4500 3895 3535

B-Max

C-Max

A Pipe

Conn.

E-CLOSED

F-OPEN

Dimension – Inches

NPT Conn.

B C D – min. E F Weight oz.

⁄4 2

⁄8

⁄8 2

⁄2 3 3

⁄8 8

⁄2 2

⁄4 1

⁄4 2

⁄2 3

⁄16 3

⁄16 21

Type Number Conn. Material Available Ranges

25-255B

(1)

⁄4 NPTF Brass

10-150 psi

(2)

25-255S

(1)

⁄4 NPTF 303 SS

150-500 psi

500-1000 psi

50-2550D

(3)

⁄2 NPTF 316 SS 1000-3000 psi

1 2 3 4 5 6 7

Commentaires sur ces manuels

Pas de commentaire

Ashcroft Options Manuel d'utilisateur Page 4

Commentaires sur ces manuels

Produits connexes et manuels pour Instruments de mesure Ashcroft Options