SVB-Series Standard with Threaded Connections

Models

SVB: Brass

 

  • Specially designed for flammable fluids
  • UL 842 Approved
  • API 614 & 520 Approved
  • Chatter-free operation
  • Mount in any position
  • Suitable for continuous duty

 

Size Range: 3/8″ – 2″

Pressures: 3 – 500 psi

Flow Rate: Up to 150 gpm

 

 

INSTALLATION, MAINTENANCE & OPERATION

 

Installation

Fulflo valves can be mounted in any position. A tee may be inserted in the pump discharge line to mount the valve. The correct size of the valve should be installed, preferably matching the pump discharge line. Screw the valve into the nipple in the tee. When the valve is used for frequent bypassing of oil under pressure, its outlet should be piped back to the tank. Care must be taken to have the discharge well below the oil level in the tank to prevent air entrainment and erratic operations.

 

Only if the valve is used as safety or overload relief and operates infrequently may its discharge be piped back into the pump suction line. Frequent or continuous operation under these conditions will cause excessive heating of the oil and possible damage.

 

Setting Valves

Valve may be set with a hand pump for cracking pressure. It will be noted that the maximum set pressure is limited by the collar “J” soldered to the adjusting screw “C”.

 

If a test stand is available, valve should be connected to the discharge header with the pump bypass open, and the bypass gradually closed until the desired pressure registers on the gauge. Adjust valve adjusting screw until valve slightly bleeds at the set bypass pressure and lock adjusting screw.

 

If valve is required to bypass a given amount of fluid at a given pressure, a test stand having a flow meter in the pump discharge line must be available. With valve adjusted for cracking pressure as above, continue closing bypass until the required flow registers on the flow meter and observe pressure. Re-adjust pressure, if necessary, to obtain desired pressure at desired flow.

 

Maintenance & Operation

Fulflo valves provided reliable “chatter-free” operation when the system is free of abrasives and foreign matter. Continuous filtration of the liquid used is strongly recommended.

TYPICAL DISASSEMBLY OF STANDARD TYPE VALVE

SVB-Series Valve Disassembly

To dismantle valve for inspection and cleaning:

 

  1. Remove cap “B”
  2. Remove gasket “E” (replace, if necessary)
  3. Loosen lock nut “F”
  4. Remove adjusting screw “C” (Limit collar “J” is soldered to adjusting screw “C”, to limit the maximum pressure to which the valve may be subjected.) Limit collar is set at 25% above normal pressure setting.
  5. Remove lock nut “F”
  6. Remove retainer “D”
  7. Remove spring “G”
  8. Remove piston “I”
  9. Remove stop ring “H” (Not Recommended-special tooling is required to install new stop ring)

Inspect valve bore and piston for wear or scoring. Replace broken or damaged parts. Clean all parts thoroughly and re-assemble by reversing the above procedure.


ASSEMBLY NUMBER IDENTIFICATION

Symbol Number Designation Code Description
1 Style S Underwriter Listed
2 Series V
3 Material B Brass
4 or 5 Size -25
-35
-45
-55
-65
-75
-85
3/8”
1/2”
3/4”
1”
11/4
11/2
2
6 Spring /AS
/US
/WS
/XS
/YS
/ZS
Pressure Range = 3 – 10 psi (spring color: black)
Pressure Range = 7 – 35 psi (spring color: red)
Pressure Range = 30 – 100 psi (spring color: green)
Pressure Range = 60 – 175 psi (spring color: yellow)
Pressure Range = 150 – 350 psi (spring color: white)
Pressure Range = 300 – 500 psi (spring color: blue)
7 Piston 0
1
2
3
Hardened Steel, deep groove
Stainless Steel, deep groove
Hardened Steel, shallow groove
Stainless Steel, shallow groove

Example

 

SVB-55ZS0
S V B -55 ZS 0
Underwriter Listed Series Brass 1” Spring Hardened Steel Piston, Deep Groove

NOTE: A definite pressure setting is required due to Underwriter restrictions. A limiting device is furnished to prevent over-adjustment more than 25% above set pressure.

How to Order

 

Specify:

1. Valve Model Number
2. Spring Letter
3. Piston Number
4. Pressure Setting


DIMENSIONS & PARTS

Dimensions in Inches

 

Pipe Size “U.L.” Symbol AA BB CC DD REF
3/8’” SVB-25 511/32 13/8 13/8 13/8
1/2” SVB-35 63/16 111/16 17/16 17/16
3/4” SVB-45 615/16 115/16 113/16 111/16
1” SVB-55 87/32 29/32 29/32 21/16
11/4 SVB-65 99/16 29/16 29/16 21/2
11/2 SVB-75 111/16 211/16 211/16 27/8
2″ SVB-85 13 3 3 31/4

Cutaway Drawing

 

SVB Series Valve Dimensions

Parts List

 

Valve Size

Sym. Name 3/8” 1/2” 3/4” 1” 11/4” 11/2” 2”
A Body 200-B 300-B 400-B 500-B 600-B 700-B 800-B
B Cap 201-B 301-B 401-B 501-B 601-B 701-B 801-B
C Adjusting Screw 202-B 302-B 402-B 502-B 602-B 702-B 802-B
D Retainer 203-B 303-B 403-B 503-B 603-B 703-B 803-B
E Gasket 204 304 404 504 604 704 804
F Lock Nut 205-S 305-S 405-S 505-S 605-S 705-S 805-S
G Spring See Chart* See Chart* See Chart* See Chart* See Chart* See Chart* See Chart*
H Stop Ring 208-B 308-B 408-B 508-B 608-B 708-B 808-B
I Piston
Hardened Steel, deep groove
Stainless Steel, deep groove
Hardened Steel, shallow groove
Stainless Steel, shallow groove

206-G
206-AG
206
206-A

306-G
306-AG
306
306-A

406-G
406-AG
406
406-A

506-G
506-AG
506
506-A

606-G
606-AG
606
606-A

706-G
706-AG
706
706-A

806-G
806-AG
806
806-A
J Limit Column 221-B 321-B 421-B 521-B 621-B 721-B 821-B

PERFORMANCE DATA

 

All valve tests 110˚F. to 120˚F. Oil Viscosity 150 SSU at 100˚F

(Charts good from 30 to 500 SSU)

SVB Series Valve Performance

Overpressure: The pressure increase or accumulation above the set pressure when the valve is discharging flow.