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Principle of Operation

Regulator

The regulator is operated by initial steam or fluid 

pressure. It is normally closed, being held so by initial 

pressure on the disk and by an internal main spring, 

see Figure 3. When the pilot is opened (see pilot 

instructions), initial pressure flows through the pilot 

to the 8B tee. 4A bleed port restricts the flow and 

pressure builds under the diaphragm and opens the 

main valve.
Delivery pressure feeds back through the control pipe 

to the pilot diaphragm. As this pressure approaches a 

balance with the thrust of the adjusting spring, the pilot 

throttles the loading pressure. In turn, the main valve 

takes a position established by the loading pressure 

where just enough steam flows to maintain the set 

delivery pressure.

Condensate Chamber

Main valves with large internal volumes, or valves 

used in relatively high pressure or superheat, may 

require more water than can be condensed from 

radiation alone. Live steam will rapidly degrade the 

rubber diaphragm of a Type E5 and generally yield 

poor control in other main valves. To prevent this 

from happening, the Condensation Chamber and 

the base are primed with water before start-up. As 

the pilot opens, medium pressure steam flows to the 

Condensation Chamber condensing the vapor in the 

presence of the prime and larger radiational area. 

The condensate exits the chamber through a No. 5B 

Open Elbow directed to the No. 5A Restriction Elbow 

in the hood. This condensate collecting under the 

diaphragm creates a loading pressure which forces the 

valve open.

Installation

 

 WARNING

Personal injury or system damage 

may result if this regulator is installed, 

without appropriate overpressure 

protection, where service conditions 

could exceed the limits given in 

the Specifications section and/or 

regulator nameplate.

Additionally, physical damage to the 

regulator may result in personal injury 

or property damage due to escaping of 

accumulated gas. To avoid such injury 

and damage, install the regulator in a 

safe location.

Under enclosed conditions or indoors, 

escaping gas may accumulate and be an 

explosion hazard. In this case, the vent 

should be piped outdoors.

For regulator constructions with a 

spring case vent, the vent should be 

kept open to permit free flow of gas 

to the atmosphere. Protect openings 

against entrance of rain, snow, insects 

or any other foreign material that may 

plug the spring case vent or vent line.
All pressure equipment should be installed 

in a non-seismic area; should not be 

exposed to fire; and should be protected 

from thunderbolt (lightning) strikes.

Planning

•  Locate the valve in a straight run of horizontal pipe. 
•  Allow headroom above the valve for access through 

the blind flange. 

•  Provide clearance for stem withdrawal underneath. 
•  Prevent water hammer and erratic operation by 

installing traps to provide proper drainage before 

and after the valve and before secondary pressure 

relief valve or control valve.

•  Avoid damaging effects of scale and dirt in the pipe 

lines by using a strainer as shown in Figure 2. 

•  Provide a three-valve by-pass to facilitate 

inspection without interrupting service.

•  To eliminate excessive noise and erratic regulation 

with steam and other compressible fluids, enlarge 

the delivery pipe size to effect a reasonable 

flow velocity at the reduced pressure. A tapered 

transition is recommended. 

•  If possible, avoid a sharp turn close to the regulator 

outlet and a bull-headed tee connection to the low 

pressure main.

•  Install initial and delivery pressure gages to 

indicate performance.

•  If the pressure rating of the delivery system or 

connected equipment is less than the initial steam 

pressure, provide a safety valve.

3

Type E5

Summary of Contents for E5

Page 1: ...e operation Either condition may result in equipment damage or personal injury Only a qualified person shall install or service the Type E5 main valve Introduction Scope of the Manual This manual provides instructions for the installation troubleshooting maintenance valve setting and parts ordering for Type E5 main valve regulator Product Description The Spence Type E5 Main Valve is pilot operated...

Page 2: ...in Valve Pressure and Temperature Rating SEAT FACTOR REGULATOR SIZE NPS DN 3 4 20 1 25 1 1 4 32 1 1 2 40 2 50 2 1 2 65 3 80 4 100 5 125 6 150 8 200 10 250 12 300 Full 7 6 11 7 18 9 27 4 43 67 95 159 258 350 665 1018 1611 Normal 5 7 10 0 13 4 19 8 25 35 59 120 176 228 366 525 952 VALVE SIZE CAST IRON CAST STEEL NPT CL125 CL250 CL150 CL300 NPS DN lbs kg lbs kg lbs kg lbs kg lbs kg 3 4 20 23 10 1 25 ...

Page 3: ...ts given in the Specifications section and or regulator nameplate Additionally physical damage to the regulator may result in personal injury or property damage due to escaping of accumulated gas To avoid such injury and damage install the regulator in a safe location Under enclosed conditions or indoors escaping gas may accumulate and be an explosion hazard In this case the vent should be piped o...

Page 4: ...let of the main valve body Note bleed orifice in this fitting is vital to operation of regulator 3 Screw 8B tee into 1 8 in pipe tap in pilot Select tap facing downstream 4 Screw No 5B elbow into 1 8 pipe tap on underside of main valve diaphragm chamber 5 Connect tubing bends as illustrated in Figure 3 AT LEAST 20 PIPE DIAMETERS D2 TO FIRST TURN SECONDARY PRV OR CONTROL VALVE RECOMMENDED AT LEAST ...

Page 5: ...se 1 4 in pipe for this line which connect the pilot diaphragm chamber to the desired point of pressure control 2 Take the control at a point of minimum turbulence Avoid control immediately at the valve outlet or after a turn 3 When the delivery pipe expands in size select a spot at least 4 pipe diameters beyond the point of enlargement 4 Pitch away from pilot to avoid erratic operation and excess...

Page 6: ...g Failure to Open If the main valve failed to open check the following possible causes to properly correct the problem Adjusting spring on pilot may have been tampered with Initial pressure may be down due to partially closed supply valve clogged strainer or other obstruction No 4A bleed port fitting may have been omitted and an open coupling substituted Control pipe may be plugged Most likely poi...

Page 7: ...ot recommended Check the following after operation Then schedule an inspection as required 1 Inspect for dirt collected at 4A bleed port 2 Inspect all joints for leakage Keep bolts tight to avoid any leaks Main Valve Maintenance See Figure 5 1 Connect a source of air or water pressure which can be adjusted by hand to the No 5B elbow 2 Apply 30 psi 2 07 bar to jack valve open and prevent stem from ...

Page 8: ...00 WAL04 00518 00 WAL04 00518 00 WAL04 00518 00 WAL04 00521 00 WAL04 00521 00 WAL04 00548 00 WAL04 00548 00 WAL04 00520 00 WAL04 00520 00 12 Stem 125 lb Stem 250 lb Steam Internal balance Stainless Steel Stainless Steel Stainless Steel WAL04 05232 01 WAL04 05643 00 WAL04 05242 01 WAL04 05242 01 WAL04 11180 00 WAL04 05246 01 WAL04 05246 01 WAL04 05645 00 WAL04 05383 01 WAL04 05383 01 WAL04 03132 00...

Page 9: ... 00522 01 WAL04 00515 00 WAL04 00522 01 WAL04 00519 01 WAL04 00523 00 WAL04 00519 01 WAL04 00523 00 WAL04 00516 01 WAL04 00517 01 WAL04 00524 02 WAL04 00524 02 12 Stem 125 lb Stem 250 lb Steam Internal balance Stainless Steel Stainless Steel Stainless Steel WAL04 05281 00 WAL04 05384 01 WAL04 08233 00 WAL04 05287 01 WAL04 05386 01 WAL04 05831 00 WAL04 05374 00 WAL04 05385 01 WAL04 10709 00 WAL04 0...

Page 10: ...Figure 4 Type E5 Assembly Drawing NO 5A RESTRICTION ELBOW SERIAL NUMBER PLATE INNER VALVE ASSEMBLY SIZES 3 8 IN 1 1 2 IN PORT INCLUSIVE INTERNAL BALANCED INTEGRAL MOUNTED BLIND FLANGE 10 Type E5 ...

Page 11: ...2 40 7 16 5 32 x 13 16 5 32 2 50 9 16 5 32 x 15 16 5 32 2 1 2 65 1 1 16 3 16 x 15 16 3 16 3 80 1 3 16 3 16 X 1 3 8 3 16 4 100 1 1 16 1 4 X 1 3 4 1 4 5 125 1 5 16 5 16 X 1 3 4 5 16 6 150 1 9 16 5 16 X 2 5 16 8 200 2 1 16 3 8 X 2 3 8 10 250 2 9 16 3 8 X 2 1 2 3 8 12 300 3 1 16 1 2 X 2 3 4 1 2 Table 6 Type E5 Main Valve K Values K TOTAL TRAVEL SETTING STEM SPRING BASE STOP PRESSURE PLATE DOWEL GROOVE...

Page 12: ...are property of their prospective owners The contents of this publication are presented for informational purposes only and while every effort has been made to ensure their accuracy they are not to be construed as warranties or guarantees express or implied regarding the products or services described herein or their use or applicability All sales are governed by our terms and conditions which are...

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