Catalogs >
FISHER REGULATORS >
Types 634 and 634M High-Pressure Shutoff Valves

Types 634 and 634M High-Pressure Shutoff Valves
8Pages

Catalog excerpts

Types 634 and 634M High-Pressure Shutoff Valves - 1

Types 634 and 634M High-Pressure Shutoff Valves TYPE 634M SHUTOFF VALVE WITH STANDARD PIPE PLUGS IN BODY SIDE TAPPINGS TYPE 634 SHUTOFF VALVE WITH OPTIONAL tank VALVE IN UPSTREAM BODY SIDE TAPPING Figure 1. Typical Constructions Introduction Types 634 and 634M high-pressure shutoff valves (Figure 1) serve to provide overpressure protection by containment. The Type 634 shutoff valve with internal registration is installed between a pressure-reducing regulator and a downstream system or equipment (Figure 2). The Type 634M shutoff valve with external registration requires a control line and is installed upstream of a pressure-reducing regulator (Figure 3). Features • verpressure Protection without Discharge of O Gas or Liquid–Under overpressure conditions, Types 634 and 634M shutoff valves stop the flow of gas or liquid rather than letting it vent to atmosphere. • ositive Shutoff–After closing, shutoff valve stays P closed until system is shutdown and fracture disk is replaced. Tight shutoff of elastomeric seat in plug assembly provides effective isolation. • pplication Versatility–Five different fracture A disks are available to provide a choice of shatter pressure ranges. • asy Maintenance–Fracture disk, diaphragm, E and plug assembly can be replaced without removing body from line or disconnecting control line. Optional tank valves permit easy bleeding of trapped upstream and downstream pressure prior to disassembly. Fracture Disk Information The downstream pressure at which the fracture disk shatters depends on the unbalance between inlet and downstream pressure and can be determined from Figure 4. This shatter pressure is non-adjustable and can only be changed if the disk is changed (Type 634 shutoff valve), or if either the disk or inlet pressure is changed (Type 634M shutoff valve). Fracture disks are color coded to indicate their shatter pressure. The Type 634 shutoff valve has negligible unbalance because the downstream pressure is essentially the same as the inlet pressure during normal operation. Simply select the fracture disk of the appropriate color from Figure 4 according to the desired shatter pressure. The Type 634M shutoff valve can have considerable unbalance, thus causing the shatter pressure to vary approximately 2 psig / 0.14 bar per every 100 psig / 6.9 bar of inlet pressure change. Select the fracture disk of the appropriate color from Figure 4 according to the desired shatter pressure in combination w

Open the catalog to page 1

Types 634 and 634M High-Pressure Shutoff Valves - 2

Type 634 Specifications The Specifications section on this page provides the ratings and other specifications for the Types 634 and 634M. Factory specifications such as type, maximum inlet pressure, maximum temperature, maximum outlet pressure, spring range and orifice size are stamped on the nameplate fastened on the regulator at the factory. The manufacture date and original fracture disk range are printed on the disk retainer. Body Size and End Connection Style 3/4 or 1 NPT Maximum Inlet Pressure(1) 1500 psig / 103 bar Maximum Body Outlet Pressure Type 634: 150 psig / 10.3 bar Type 634M:...

Open the catalog to page 2

Types 634 and 634M High-Pressure Shutoff Valves - 3

Type 634 plug assembly reducing regulator stem optional token relief valve fracture disk inlet pressure outlet pressure Figure 2. Type 634 Shutoff Valve Installation plug assembly reducing regulator Control line stem fracture disk vent diaphragm optional token relief valve inlet pressure outlet pressure Figure 3. Type 634M Shutoff Valve Installation

Open the catalog to page 3

Types 634 and 634M High-Pressure Shutoff Valves - 4

Type 634 Fracture disk Shatter Pressure to type 634M shutoff valve, bar 0 Inlet Pressure to type 634m shutoff valve, psig Inlet Pressure to type 634m shutoff valve, bar Fracture disk Shatter Pressure of type 634m shutoff valve, psig Figure 4. Fracture Disk Selection Table 1. Fracture Disk Selection SHATTER PRESSURE FRACTURE DISK Type 634 Shutoff Valve Color Code Part Number 20 to 28 psig / 1.4 to 1.9 bar at 0 psig / 0 bar inlet pressure; see curve A for other inlet pressures 50 to 60 psig / 3.4 to 4.1 bar at 0 psig / 0 bar inlet pressure; see curve B for other inlet pressures Type 634M...

Open the catalog to page 4

Types 634 and 634M High-Pressure Shutoff Valves - 5

Type 634 TYPE 627 pressure REDUCING REGULATOR TYPE 634M SHUTOFF VALVE DOWNSTREAM CONTROL LINE OPTIONAL TYPE H120 TOKEN RELIEF VALVE Figure 5. Typical Installation Showing Token Relief Valve Table 2. Typical Capacities INLET PRESSURE TO SHUTOFF VALVE WIDE-OPEN PRESSURE DROP THROUGH SHUTOFF VALVE FLOW IN SCFH / Nm3/h OF 0.6 SPECIFIC GRAVITY NATURAL GAS 3/4 NPT Body Size Both types can be used along with a token relief valve (Figure 5) to minimize unnecessary shutoff. The relief valve is set to open before the Type 634 or 634M shutoff valve activates. This arrangement allows the relief valve...

Open the catalog to page 5

Types 634 and 634M High-Pressure Shutoff Valves - 6

1/4 NPT CONTROL LINE CONNECTION 4.75 / 121 Figure 6. Outline Dimensions Ordering Information When ordering, complete the ordering guide on this page. Refer to the Specifications section on page 2. Review the description to the right of each specification and the information in each referenced table or figure. Specify your choice whenever a selection is offered.

Open the catalog to page 6

Types 634 and 634M High-Pressure Shutoff Valves - 7

Type 634 Ordering Guide Type (Select One) Shatter Pressure (Select One) 20 to 28 psig / 1.4 to 1.9 bar, Red  50 to 60 psig / 3.4 to 4.1 bar, Yellow  72 to 88 psig / 5.0 to 6.1 bar, White  Body Size (Select One) 3/4 NPT  1 NPT  Tank Valves (Optional) Inlet  Inlet and Outlet  Specification Worksheet Application: Specific Use Line Size Gas Type and Specific Gravity Gas Temperature Relief Valve Size: Brand of upstream regulator? Orifice size of the upstream regulator? Wide-open coefficient of the upstream regulator? Regulators Quick Order Guide ***...

Open the catalog to page 7

Types 634 and 634M High-Pressure Shutoff Valves - 8

LinkedIn.com/company/emerson-automation-solutions Twitter.com/emr_automation Asia Pacific Singapore 128461, Singapore T +65 6777 8211 Middle East and Africa Dubai, United Arab Emirates T +971 4 811 8100 D100623X012 © 1991, 2018 Emerson Process Management Regulator Technologies, Inc. All rights reserved. 12/18. The Emerson logo is a trademark and service mark of Emerson Electric Co. All other marks are the property of their prospective owners. Fisher™ is a mark owned by Fisher Controls International LLC, a business of Emerson Automation Solutions. The contents of this publication are...

Open the catalog to page 8