Milton Roy H Series Instruction Manual
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Milton Roy H Series Instruction Manual

Milton Roy H Series Instruction Manual

Safety & back pressure valves
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H Series
Safety & Back Pressure
Valves
INSTRUCTION
MANUAL
339-0023-000
Issued 4/2011

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Summary of Contents for Milton Roy H Series

  • Page 1 H Series Safety & Back Pressure Valves INSTRUCTION MANUAL 339-0023-000 Issued 4/2011...

  • Page 3: Table Of Contents

    TABLE OF CONTENTS Warranty ....visit www.miltonroy.com Section 1 Introduction ......Description .
  • Page 4 TABLE OF CONTENTS (Continued) Section 5 Troubleshooting ..... . . Back Pressure Valves ....Safety Valve .
  • Page 5 LIST OF ILLUSTRATIONS Figure 1. Safety & Back Pressure Valves ... 6 Figure 2. Product Code ......7 Figure 3.

  • Page 6: Introduction

    Section 1 Introduction DESCRIPTION Milton Roy diaphragm safety valves are designed primarily to protect controlled volume pumps and asso- ciated equipment from overpressure. Milton Roy back pressure valves are engineered to ensure the neces- sary differential back pressure on controlled volume pumps in specific situations.

  • Page 7: Product Coding

    NOTE: A safety valve cannot be changed to back pressure service by simply reversing the connections. PRODUCT CODING Milton Roy safety and back pressure valves are available in several different configurations. To deter- Valve Type Size Material of...

  • Page 8: Principle Of Operation

    PRINCIPLE OF OPERATION Safety Valves (refer to Figure 5) The Milton Roy Safety Valve operates on a differen- tial area principle. The inlet pressure acts against the ball, and the resulting force is opposed by the spring. Product Coding Milton Roy safety and back pressure valves are available in several different configurations.
  • Page 9 allowing the metered volume of liquid to flow through it. As the pump discharge flow decreases to zero (suc- tion stroke), the diaphragm reseats and traps the liq- uid under pressure between the pump outlet and the valve. This maintains a constant positive pressure on the pump discharge check valve.

  • Page 10: Installation

    SECTION 2 INSTALLATION UNPACKING Units are shipped FOB factory and the title passes to the customer when the carrier signs for receipt of the unit. In the event that damages occur during shipment, it is the responsibility of the customer to notify the carrier immediately and to file a damage claim.

  • Page 11: Installation

    Since the Milton Roy safety valve is a diaphragm type, the valve must be installed so that no back pressure can be applied to the outlet*.
  • Page 12 The Milton Roy diaphragm safety valve should not be used: (1) on liquefied gas applications where the outlet cannot be opened to the atmosphere, (2) on...

  • Page 13: Figure 4. Back Pressure Valve Installation

    Back Pressure Valve (Refer to Figure 6) Generally, a back pressure valve should be in- stalled on the discharge line of the pump if the natural pressure in the pipe line is lower then the minimum allowable discharge pressure for the pump. This is usually about 50 psi.
  • Page 14 Contact Milton Roy Company for information on AccuRoy™ Pulsation Dampeners. NOTE: The Milton Roy back pressure valve should not be used in abrasive slurry applications because the slur- ry will quickly erode the seat and disable the valve.

  • Page 15: Operation

    SECTION 3 OPERATION START-UP Before starting a system with a Milton Roy safety or back pressure valve installed, make sure that the valve is set to the proper pressure for the application. The factory set pressure is stamped on the valve name- plate.
  • Page 16 Safety Valve Pressure Setting CAUTION: This procedure should be performed only by trained, competent personnel. It involves actions which, if not performed correctly, could result in serious personal injury from piping and equipment bursting (from being subjected to pressure great- er than 5000 psi) and sudden release of process chemical.
  • Page 17 a. Install a shut off valve in the pump discharge line downstream of the safety valve. b. Install a pressure gauge between the safety valve and the pump. The gauge should have a maximum pressure at least 30% higher than the safety valve setting.
  • Page 18 the gauge. h. Open the shut-off valve and turn off the pump. i. Check the relief valve setting by operating the pump with the shut-off valve open. Slowly close the shut-off valve. The relief valve should open at the previously set pressure. Readjust the re- lief valve as necessary.

  • Page 19: Maintenance

    4. Valve serial number (on valve nameplate). 5. Valve model number (on valve nameplate). Always include the serial and model numbers in all correspondence regarding the unit. All inquiries or parts orders should be addressed to your local Milton Roy Representative or sent to:...

  • Page 20: Returning Units To The Factory

    Such shipment must be prepaid and include a Milton Roy Return Material Tag. RETURNING UNITS TO THE FACTORY Milton Roy valves will not be accepted for repair without a Return Material Authorization, available from the Factory Repair Department. The valve should be...

  • Page 21: Maintenance

    MAINTENANCE General The unique design of the Milton Roy back pres- sure or safety valve permits routine inspection and repairs without removing the valve from the pump line. The upper body may be removed by loosening the union nut (K).
  • Page 22 Back Pressure Valves To keep the back pressure valve in good operat- ing condition, the following steps should be followed once a year: 1. Replace the parts contained in the recommended spares list. Refer to General Maintenance & Fig- ure 6. 2.

  • Page 23: Troubleshooting

    SECTION 5 TROUBLESHOOTING Back Pressure Valves Insufficient back pressure ....• Back pressure may not be properly adjusted. Adjust the set pressure by turning the adjusting screw (N). .

  • Page 24: Safety Valve

    Safety Valve Valve relieves at unexpectedly low pressure....• Liquid standing in out- let piping may be exert- ing back pressure on the valve, lifting the dia- phragm and ball prema- turely.

  • Page 25: Parts

    SECTION 6 PARTS SAFETY VALVE PARTS DRAWING Figure 5. Safety Valve Parts Drawing. (A-102-1110-000-C)

  • Page 26: 1/2" Safety Valve Parts List

    1/2” Safety Valve Parts List Dwg. Qty. Description Part Number Ref. Req. Lower Body (1/2) (316 SS) 208-0019-016 Lower Body (1/2) (CA-20) 208-0019-028 Lower Body (1/2) (PVC) 208-0019-271 20 Gasket (1/2) 7025-0080-175 Control Seat (3/8) (316 SS) 7024-0176-116 Control Seat (3/8) CA-20) 7024-0176-128 Control Seat (3/8) (PVC) 7024-0176-171...
  • Page 27 1/2” Safety Valve Parts List (Continued) Dwg. Qty. Description Part Number Ref. Req. 405-0157-014 Socket Head Screw (5/16-18x1/2) 407-0014-112 Ball (3/8) (316 SS) 407-0014-113 Ball (3/8) (CA-20) 407-0170-113 Ball (3/8) (PVC) 225-0069-081 Gasket (1/2) Neoprene 7208-A025-106 Upper Body (1/2) (304 SS) † 7208-0025-106 Upper Body (1/2) (304 SS) ‡...

  • Page 28: 1" Safety Valve Parts List

    1” SAFETY VALVE PARTS LIST Dwg. Qty. Description Part Number Ref. Req. Lower Body (1) (316 SS) 7208-B021-216 Lower Body (1) (CA-20) 7208-B021-229 Lower Body (1) (PVC) 208-0017-071 O-Ring (Parker 2-212) (Teflon) 408-0095-033 7024-A106-116 Ball Seat (3/4) (316 SS) 7024-A106-128 Ball Seat (3/4) (CA-20) 7024-A106-171 Ball Seat (3/4) (PVC)

  • Page 29: Figure 6. Back Pressure Valve Parts Drawing

    BACK PRESSURE VALVE PARTS DRAWING Figure 6. Back Pressure Valve Parts Drawing. (A-102-1111-000-C)

  • Page 30: 1/2" Back Pressure Valve Parts List

    1/2” BACK PRESSURE VALVE PARTS LIST Dwg. Qty. Description Part Number Ref. Req. 208-0019-016 Lower Body (1/2) (316 SS) 208-0019-028 Lower Body (1/2) (CA-20) 208-0019-271 Lower Body (1/2) (PVC) Gasket (1/2) 7025-0080-175 Control Seat (1/2) (316 SS) 7024-0176-116 7024-0176-128 Control Seat (1/2) CA-20) 7024-0176-171 Control Seat (1/2) (PVC) 7298-0045-175...

  • Page 31: 1" Back Pressure Valve Parts List

    1” BACK PRESSURE VALVE PARTS LIST Dwg. Qty. Ref. Description Req. Part Number Lower Body (1) (316 SS) 7208-B021-216 Lower Body (1) (CA-20) 7208-B021-229 Lower Body (1) (PVC) 208-0017-071 O-Ring (Parker 2-212)(Teflon) 408-0095-033 Control Seat (1) (316 SS) 7024-0179-116 Control Seat (1) CA-20) 7024-0179-128 Control Seat (1) (PVC) 7024-0179-171...
  • Page 32 Milton Roy Company (215) 441-0800 • FAX: 215-441-8620 201 Ivyland Road, P.O. Box 5011 www.miltonroy.com Ivyland, PA 18974-0577 info@miltonroy.com rev 4-2011...

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