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1. Type HF In Service Testing of Pilot Set Pressure CAUTION Never use oxygen as a pressure source Pressure from a cylinder of nitrogen or some other pressure source NOT OXYGEN may be used to check the setting or to reset the pressure at which the relief valve will operate 1 Connect pressure hose from nitrogen bottle to field test valve A 2 Close vent valve B 3 Open field test valve A 4 Slowly open block valve C permitting test pressure to increase to valve set point RELIEF VALVE y e HOOK UP TO BE FIELD TEST VALVE A EF y FURNISHED BY LAP HOSE STONER ee ee as TEST GAUGE BLOCK VALVE C Lo ee ks ak ne Oe A ae a a ko a e e n a a e a n a n on n an an a n n a Dm CHECK VALVE Type HL Typical Direct Hook Up with In Service Test Valve Gas Service Only 1 Connect pressure hose from nitrogen bottle or hydraulic hand pump to test port of header block 2 Close vent valve A UJ Slowly open block valve B or operate hydraulic hand pump permitting test pressure to increase to valve set point Observe set pressure on test gauge and record Close valve B or release pressure on hand pump Open vent valve A NO Ww A Disconnect pressure hose from test port NOTE For additional information on In Service testing refer to the service manual or technical data sheets for this product 5 Observe set pressure on test gauge and record 6 Close valves A
2. and C 7 Open vent valve B 8 Disconnect pressure hose from field test valve A NOTE For additional information on In Service testing refer to the service manual or technical data sheets for this product When a relief valve is not equipped with the In Service Test Kit a Relief and Blowdown test fixture can be used to check or change valve set and blowdown pressures in field shops Only the pilots need to be removed from the relief valve and it is not necessary to remove the valve itself from the installation The operation of this portable test fixture is simple and convenient CAUTION Never use oxygen as a pressure source Pressure from a cylinder of nitrogen or some other pressure source NOT OXYGEN may be used to check the setting or to reset the pressure at which the relief valve will operate Special training is not required and complete instructions are furnished with each fixture The test fixture may be ordered with optional needle valves and adapters for any type of pilot TYPE HL PILOT a TYPE HL RELIEF Y am y SCREEN PLUG FITTING installed When Used For Gas Service 7 HEADER BLOCK Man IN SERVICE TEST f PIR a 7 BLOCK VALVE B TEST BA GAUGE n NITROGEN BOTTLE OR HAND VENT VALVE A ET i a i Hook up To Be i Furnished By Customer Pilot Construction The Type HF pilot is a single combination control with a fixe
3. com amp AFRICA ms uk c a m com USA e CANADA e UK e CHINA e UAE e ALGERIA e MALAYSIA e INDIA e RUSSIA www c a m com flo RV RVALVE NFOOO33 1111 Copyright 2011 Cameron International Corp All Rights Reserved CAMERON
4. MEASUREMENT SYSTEMS NUFLO Pilot Operatea Safety Relief Valves Series H In the mid 1940s a new relief valve actuated with a pilot rather than a spring set a new standard for pressure control The valve manufactured over the years by companies like Full Flow Capacity Garrett USI and Axelson is now manufactured and sold by Cameron under the NuFlo brand Backflow Protection The NuFlo pilot operated pressure relief valves are an example of a tradition of advanced design and high quality manufacturing abilities These valves offer advantages not found in other relief valves spring or pilot operated Non Flowing Pilots Simple Maintenance Coated Bodies Easier Handling Valve Types Type HF This is a full lift pop action valve with a fixed 5 to 7 blowdown using a single non flowing pilot This type of valve is designed for gas and or vapor service and is offered in sizes of 1 through 8 with operating pressures ranging from 25 psig to 6000 psig Advantages Full Flow Capacity In addition to the various API orifice sizes Cameron offers valves with non standard API orifice sizes for maximum flow capacity and smoother operation Many times this allows for the use of smaller size valves at a cost savings to the customer Backflow Protection The unique NuFIo split piston optional is designed to eliminate the effect of pressure in the discharge system back flowing into a relief valve on installat
5. ON PILOT LIFTING j EYE po PISTON 7 HOUSING M he pan f ay Te ty f an mm ki af f Below Type HF relief valve closed position COMBINATION j OPTIONAL PILOT Oo A f SOUD or SPLIT F ee o PISTON Solid Piston Shown HEADER BLOCK gt DISCHARGE SEAT PILOT f SENSING E E n PRESSURE gt ail PICK UP OPTIONAL VALVE pa i 4 q i H ii G BODY INLET Soft Seal Shown Relief Valve Open When system pressure reaches the set point the pilot piston is lifted off the valve seat The blowdown seat seals off incoming line pressure causing the exhaust port to open and bleed pressure trom the relief valve piston cavity Decreasing pressure on the top of the relief valve piston allows the valve to open relieving system overpressure As system pressure drops below the blowdown reset point the blowdown seat opens reseating the pilot piston which causes the exhaust port to close System pressure re enters the relief valve piston cavity closing the relief valve High Pressure Right Type HF relief valve relieving position Operation Type HL Relief Valve Closed At below set point the normally open Type HL pilot allows system pressure to enter the piston housing cavity of the relief valve on top of the free floating piston The top of the relief valve piston has a larger area than the valve seat where the piston seals Equal
6. S 316 55 316 55 316 SS Header Block CS 316 SS CS 316 SS 316 SS 316 SS CS 3 316 SS Pilot Valve 316 SS 316 SS 316 55 316 SS 316 SS 31655 31655 316 SS Notes 1 A 216 Gr WCB 2 A 351 Gr CF8M 3 HRc 22 maximum Mn Soft Seat Service Material Buna N Viton Teflon Peek S S Sizing Order Form GENERAL INFORMATION Company Name Customer Name Date Tag Number Service Quantity INPUT DATA Continuous Temperature F Maximum Minimum 273 65 400 65 400 423 480 423 Minimum Pressure psi Pilot Main 15 15 15 15 60 1500 1500 Maximum Pressure psi Pilot Main 6000 1500 6000 1500 1500 3000 6000 A relief valves primary purpose is to protect lives and property It is imperative that the proper valve be selected for your application To assure that the proper valve is selected please fill out the Order or Sizing Order Form and consult your Cameron representative for assistance Specific Gravity Mol Weight Ratio of Specific Heats K Compressibility Factor Z Required Capacity Set Pressure Relief Temperature Allowable Overpressure Back Pressure Fluid Type amp State OPTIONS Model Piston Type Hook up Type Trim Seal Material Seat Type Other MISCELLANEOUS Additional Information HF Snap Acting 5 to 7 Fixed Blowdown Solid C Split Back Flow Pr
7. T NF i S AS F pr im AN if i IL HAND l INI VALVE i i l l 6 x Pipe Dia Ta ee MEASUREMENT SYSTEMS Orifice Selection Available Orifice Sizes for Type HF and HL Pilot Operated Relief Valves Valve Coefficient 0 859 gas 0 674 liquid Valve Size Outlet Orifice Orifice Area Sq In Valve Size Outlet Orifice Orifice Area Sq In it a Single D 0 110 3 x4 Single J 1 287 E 0 196 K 1 838 F 0 307 L 2 853 G 0 503 M 3 600 GX 0 652 N 4 340 1 0 785 P 6 380 1 1 2 x 2 Single D 0 110 3 7 068 E 0 196 4 x 6 Single Dual L 2 853 F 0 307 M 3 600 G 0 503 N 4 340 H 0 785 P 6 380 1 287 4 12 566 JX 1 633 6 XE Single Dual Q 11 045 1 1 2 1 767 R 16 000 1 1 2 x 3 Single G 0 503 T 26 000 H 0 785 6 28 270 J 1 287 8 x 8 Dual Q 11 045 JX 1 633 R 16 000 1 1 2 1 767 T 26 000 ae E Single G 0 503 7 38 484 H 0 785 7 1 2 44 178 J 1 287 8 x 10 Single Dual Q 11 045 JX 1 633 R 16 000 K 1 838 T 26 000 KX 2 776 T 38 484 2 3 141 7 1 2 44 178 Trims Available Materials of Construction Standard Stainless Steel Full Stainless Steel NACE HF HL HF HL HF HL HF HL Body CS 1 CS 1 CS 1 CS 1 55 2 SS 2 CS 1 3 CS 1 3 Piston Housing CS 1 CS 1 CS 1 CS 1 SS 2 SS 2 CS 1 3 CS 1 3 Piston AL AL 316 SS 316 35 316 55 316 55 316 SS 316 55 Valve Seat 316 SS 316 SS 316 55 316 SS 316 55 310 55 316 55 316 SS Orifice 316 SS 316 SS 316 SS 316 SS 316 S
8. ack through valve when working on line Combines functions of blowdown and safety valves Saves cost of additional valves and piping Higher capacity per valve size Field test of pilot set pressure Set pressure can be checked or changed with valve still in service Can be used with solenoid valve For electric or pneumatic interface Coated internally and externally Bodies and piston housings Xylan coated for corrosion protection and lubricity Balanced pilot Allows venting into discharge system without effect of back pressure Application A pilot operated pressure relief valve according to the 1992 ASME Code Section VIII Division 1 Section UG 126 is a pressure relief valve in which the major relieving device is combined with and is controlled by a self actuated auxiliary pressure relief valve NuFlo pilot operated pressure relief valves are designed to be used wherever there is a need to exhaust Valve Operation NuFlo pilot operated safety relief valves operate on the principle of unequal areas exposed to the same pressure When the relief valve is closed system pressure pushes upwards against the piston seat seal on an area equal to the inside diameter of the seat Simultaneously the same system pressure passes through the pilot exerting a downward force on the piston acting on an area approximately 50 greater than the inside diameter of the seat The resulting differential force holds the valve tightly closed As the syst
9. d blowdown for controlling relief valve opening and closing pressure set points The opening set pressure is determined by the force of a control spring which holds the relief control section of the valve closed When system pressure acting on the relief control valve seat area equals the spring force the relief control opens and the blowdown control section closes blocking system pressure from passing into the chamber above the main valve piston As the relief control opens the pressure underneath the control seat is exposed to a larger pressure area which provides snap action of the control pilot to quickly reduce pressure in the piston dome This pressure reduction causes the main valve piston to lift relieving system pressure COMBINATION PILOT ADJUSTMENT CAP S __ THRUST BEARING After the system pressure is reduced to a point whereby the control valve spring forces the blowdown control ball to unseat the relief control valve closes and the open STEM EXHAUST Eak blowdown control valve ASSEMBLY allows system pressure PUSH ROD to re enter the piston dome forcing the main piston down to a closed valve position BALL SEAL SENSING PRESSURE INLET Function of the Split Piston Normal Piston Position All NuFlo pilot operated pressure relief valves can be ordered with the exclusive NuFlo split piston This piston is designed to eliminate the effect of back pressure imposed on t
10. ded valves which may not conform to new safety standards In Service Test Kit This optional feature allows checking or changing the pilot set pressure in the field with the valve in service Manual Blowdown This optional device which allows manual blowdown of the system can also be controlled from a remote location Direct or Remote Control Depending on the application the operation of the NuFlo pilot operated safety relief valve may be controlled directly from the point of installation or remotely No Simmer NuFlo pilot operated safety relief valves are designed to eliminate simmer at the valve seat They do not require percent accumulation or over pressure to operate Special Flanges NuFlo pilot operated safety relief valves can be supplied with special flanges such as Graylock Taper Lok Lenz etc Advantages and Features Easy and economical to maintain All maintenance can be performed without removing valve from line Replaceable soft seat Saves costly lapping of valve seat Operates without simmer at valve seat MEASUREMENT SYSTEMS NuFlo Pilot Operated Competitive Spring Can be set close to system operating pressure Unaffected by vibration of pulsation Block and bleed pilot as standard Reduces freeze ups caused by pressure drop through flowing type pilots Accurate setting with small volume of pressure Test fixture available for fast accurate setting Backflow protection Prevents flow of gas b
11. em pressure rises the force against the piston seal increases HF HL Loaded Valve Yes Yes No Yes Yes Yes Yes Yes No Yes Yes No Yes Yes No Yes Yes No Yes Yes No Yes Yes No No Yes No Yes Yes No Yes Yes No No Yes No the overpressure volume of gas vapor and or liquid Applications include oil and gas production systems compressor stations gas transmission pipelines facilities storage systems distribution systems and in all types of processing plants Then when the system pressure reaches the relief valve discharge set pressure the pilot cuts off system pressure and opens the top of the piston to vent pressure As the pressure above the piston is relieved the relief valve opens discharging line pressure When the predetermined blowdown pressure is reached the pilot shuts off the exhaust and re opens the flow of system pressure to the top of the piston effectively closing the relief valve Mn T Operation Type HF Relief Valve Closed Type HF Relief Valve At below set point the normally open Fixed Blowdown 5 7 combination pilot allows system pressure to enter the piston housing cavity of the relief ae valve on top of the free floating piston The top ie of the relief valve piston has a larger area than the valve seat where the piston seals Equal pressure at both ends of the piston creates a differential downward force which holds the piston tightly closed on the valve seat COMBINATI
12. eventor Direct Sensing L Remote Sensing Standard L Stainless Steel NACE Buna L Viton Other Soft LI SS Hard Peek In service Test Kit Manual Blowdown Valve Remote Unloader C Pilot Filter Dome Spring LJ HL Modulating 3 to 5 Fixed Blowdown Teflon MEASUREMENT SYSTEMS Relief Valve Order Form GENERAL INFORMATION Company Name Customer Name Date Tag Number Service Quantity ISERVICE CONDITIONS Set Pressure Service Vessel Number Fluid Type amp State VALVE SELECTION Model HF Snap Acting 5 to 7 Fixed Blowdown LJ HL Modulating 3 to 5 Fixed Blowdown Part Number Inlet Size amp Rating Outlet Size amp Rating Orifice OPTIONS Piston Type Solid C Split Back Flow Preventor Hook up Type Direct Sensing Remote Sensing Trim Standard C Stainless Steel NACE Seal Material Buna L Viton Other Seat Type Soft SS Hard Peek Teflon Other In service Test Kit Manual Blowdown Valve Remote Unloader Pilot Filter Dome Spring MISCELLANEOUS Additional Information MEASUREMENT SYSTEMS Xylan is a registered trademark of Whitford Corporation MEASUREMENT SYSTEMS HOUSTON 281 582 9500 NORTH 1 800 654 3760 ASIA 603 5569 0501 EUROPE 44 1243 826741 HEAD OFFICE AMERICA PACIFIC MIDDLE EAST ms usQc a m com ms klQc a m
13. he discharge side of the valve HL PILOT pam HEADER BLOCK MEASUREMENT SYSTEMS The Type HL pilot is a single control pilot with a fixed blowdown for controlling the opening and closing of the relief valve Opening and closing pressures are determined by the force of a pilot control spring System pressure is applied to the pilot control piston and also to the pilot inlet Hi port The lifting force produced by the pressure on the control piston is reacted by the opposing force of the pilot spring When the spring force is greater than the pressure force of the control piston system pressure is communicated through the inlet Hi port of the pilot to the top of the relief valve piston Since the area on top of the relief valve piston is greater than the seat area the valve is held in the closed position As pressure increases above the set point the force of the control piston becomes greater than the reacting spring force This unbalanced condition shifts the pilot stem upward blocking the pressure coming into the inlet Hi port and allowing the pressure above the relief aaa towo valve piston to bleed off As the pressure force which holds the piston on the seat decreases SPRING LOCKNUT the relief valve opens If system pressure i Se STEM continues to rise the mou w YY aa m piston lifts fully and aj aaa ja 7 SS messin remains open until system pressure Is reduced sufficiently for t
14. he pilot spring to shift the pilot into its SENSING PISTON a za ae igi TO INLET i A fe E flowing position ae cnt aC wes uP ABOVE Split Piston Separated The split piston is recommended for installations where a manifold discharge system serves a number of relief valves If a manifolded relief valve is out of service when one or more other valves exhausts into the common discharge system the split piston separates and prevents backflow through the out of service valve SOOO Installation Schematics Types HF Type HL Direct Hookup Relief valves configured for direct operation are equipped with an internal pressure pickup tube stinger in the throat of the valve inlet They are factory shipped as self contained assemblies ready for installation Remote Hookup Relief valves configured for remote operation do not contain an integral pressure pickup connection Pressure Is sensed from a remote point on the vessel process line through a single tube connected to the header block located on the valve PILOT S U 3 i ih 3 BLOCK i VALVE g HAND lt gt pa m koi 6 x Pipe Dia TYPE HL TYPE HL RELIEF VALVE TYPE HL PILOT RELIEF VALVE BY CUSTOMER a mw L lt D FI VALVE VESSEL RELIEF VALVE m TYPE HL RELIEF VALVE TYPE HL RELIEF VALVE PILOT S TYPE HL PILOT TYPE HL PILOT amp I
15. ions where several valves discharge into a common manifold Simple Maintenance All maintenance including changing the valve seat can be performed using ordinary hand tools without removing the valve from the installation Non Flowing Pilots NuFlo non flowing pilots reduce the problems of freeze up caused by the pressure drop through the flowing type pilots Coated Bodies The bodies and piston housings of all NuFlo pilot operated safety relief valves are internally and externally coated with Xylan for corrosion protection and lubricity Easier Handling A lifting eye is conveniently located on the center of the valve for ease of handling during installation or removal Type HL This is a modulating valve with a fixed 3 to 5 blowdown using a single non flowing pilot This valve is designed for gas vapor and or liquid service and Is offered in sizes of 1 through 8 with operating pressures ranging trom 25 psig to 1500 psig Features Soft or Hard Seat Seals Soft or hard seat seals are available for a variety of service conditions and applications Soft seat seals are recommended for discharge set pressures of 25 psi to 1500 psi Hard seat seals are recommended for discharge set pressures above 1500 psi Variable Flange Dimensions Flange dimensions can be modified on special order to fit most existing installations This permits NuFlo pilot operated safety relief valves to be used as replacements for older spring loa
16. pressure at both ends of the piston creates a differential downward force which holds the piston tightly closed on the valve seat Below Type HL relief valve closed position Relief Valve Open When system pressure reaches the set point the pilot piston forces the pilot stem upward by compressing the pilot valve spring This movement of the stem simultaneously blocks the system pressure passageway through the pilot and commences the bleeding of pressure from the relief valve piston housing cavity Decreasing pressure on the top of the relief valve piston allows system allows the valve to open relieving system overpressure As system pressure drops below the blowdown reset point system pressure re enters the relief valve piston cavity closing the relief valve Right Type HL relief valve relieving position MEASUREMENT SYSTEMS Type HL Relief Valve LIFTING EYE m PISTON HOUSING f a a n a Br a aa A r 1 koi 4 OPTIONAL Pr JZ SOLID or SPLIT Jr PISTON i Solid Piston Shown f j HEADER fy BLOCK fd ia a SEAT PLOT menn SENSING l PRESSURE ae i OPTIONAL e SOFT or HARD vwe FG t ment INLET Soft Seal Shown lo Ia af e je A f a j it a ee eee In Service Testing and Pilot Setting Options All NuFlo pilot operated pressure relief valves may be ordered with an In Service Test Kit The procedures for the use of this In Service Kit are shown below

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