Mark 6127 Series. Pressure Regulators Mark 6127 Series. Pressure Reducing Valves. Valve Features. Operation
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- Rosalind Newton
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1 Mark 6127 Series Pressure Reducing Valves The primary function of the Mark 6127 is to reduce a greater upstream pressure to a lesser, more manageable downstream pressure, operating without regard to either upstream supply or downstream demand. Operation Pressure Reducing The normally open, spring loaded pilot, sensing downstream pressure, responds to changes in pressure and causes the main valve to do the same. The net result is a constant modulating action of the pilot and main valve to hold the downstream pressure constant. The pilot system is equipped with an opening speed control that fine tunes the valve response to the system variables. Valve Features Operates automatically off line pressure. Outlet pressure is accurate over wide range of flow. Pilot-operated main valve is not subject to pressure fall off characteristic of direct acting PRV's. Outlet pressure is adjustable over complete range of control spring (see pilot features). Heavy-duty, nylon-reinforced diaphragm. Rectangular-shaped, soft seat seal provides drip tight Class VI closure. Diaphragm assembly Guided top and bottom. Throttling seat retainer for flow and pressure stability. Easily maintained without removal from the line. Replaceable seat ring. Alignment pins assure proper reassembly after maintenance. Valves are factory tested. Valves are serial numbered and registered to facilitate replacement parts and factory support. Jordan Valve, a division of Richards Industries 3170 Wasson Road Cincinnati, OH (f) info@richardsind.com Pressure Regulators Mark 6127 Series
2 Specifications Sizes: Globe Flanged: 1.25"- 24" (32 mm mm) Flanged: 1.25" - 16" (32 mm mm) Glove/ Threaded: 1.25" - 3" (32 mm - 80 mm) Globe Grooved: 1.5" - 4" (32 mm mm) End Connections: Flanged Threaded Grooved Temperature Range: (Valve Elastomers) Buna-N: -20 F to 180 F (-29 C to 82 C) Viton: 20 F to 230 F (7 C to 110 C) Fluorisilicon: -40 F to 150 F (-40 C to 66 C) EPDM: 0 F to 230 F (-18 C to 110 C) Spring Ranges: (outlet setting) 5-30 psi (0,34-2,07 bar) psi (1,38-5,52 bar) psi (4,48-12,41 bar) psi (6,89-20,68 bar) Materials: Body/Bonnet: Ductile Iron (epoxy coated), Carbon steel (epoxy coated), Stainless Steel, B61 bronze, Ni-Al-Bronze, Duplex Stainless Steel, Monel Seat Ring: Bronze B61, Stainless Steel, Optional: Ni-Al-Bronze, Duplex Stainless Steel, Monel Stem: Stainless Steel, Monel, Optional: Duplex Stainless Steel Spring: Stainless Steel. Optional: Inconel Diaphragm: Buna-N Nylon Reinforced, Viton, EPDM Seat Disc: Buna-N, Viton, EPDM Pilot: Bronze, Stainless Steel (Other pilot system components: Bronze/Brass, All Stainless Steel) Optional: Ni-Al-Bronze, Duplex Stainless Steel, Monel Tubing & Fittings: Copper/brass, Stainless Steel, Optional: Monel Valve Size Globe Valves Cv Range Valves Cv Range Flow for 25ft/ sec GPM 1-1/4" 1-1/2" " /2" , , , , , , , ,300-2-
3 Dimensions Dim. End Conn. 1 1/4 1 1/ / A Threaded 8 3/4 9 7/8 10 1/2 13 Grooved 8 3/4 9 7/8 10 1/ / # Flg 8 1/2 9 3/8 10 1/ /4 25 3/8 29 3/ / # Flg 8 3/4 9 7/8 11 1/8 12 3/4 15 5/8 18 5/8 26 3/8 31 1/8 35 1/2 40 1/ /4 B Threaded 1 7/ /16 1 7/8 2 1/4 C D Grooved 1* 1 3/16 1 7/16 1 3/4 2 1/4 3 5/16 150# Flg 2 5/16-2 1/ /2 3 3/4 4 1/2 5 1/2 6 3/ /2 10 5/8 11 3/ # Flg 2 5/8-3 1/16 3 1/4 3 3/4 4 1/ /4 7 1/2 8 3/4 10 1/4 11 1/2 12 3/4 18 Threaded 4 3/8 4 3/ /2 Grooved 4 3/8* 4 3/ /2 7 5/8 150# Flg 4 1/4 4 3/ / / / /16 300# Flg 4 3/ /8 6 3/8 7 13/ /2 13 3/ / /4 21 5/8 Threaded 3 1/8 3 7/ /2 Grooved 3 1/8* 3 7/ /2 5 5/8 150# Flg 3 3 7/ / / /16 300# Flg 3 1/6 4 1/8 4 3/8 4 3/8 5 13/16 6 1/2 8 1/2 12 1/ /4 16 1/2 E ALL / /8 15 3/ F ALL 3 7/8 3 7/8 3 7/8 3 7/8 3 7/8 3 7/8 6 3/8 6 3/8 6 3/8 6 3/8 6 3/8 8 G ALL /16 8 3/4 8 3/4 11 3/ / /4 34 1/2 52 H ALL /2 *Grooved end not available in 1 1/4" Dim. End Conn. DN32- DN40 U.S. Dimensions- Inches DN50 DN65 DN80 DN100 DN150 DN200 DN250 DN300 DN350 DN400 DN600 A Threaded Grooved # Flg # Flg B Threaded C D Grooved 25* # Flg # Flg Threaded Grooved 111* # Flg # Flg Threaded Grooved 79* # Flg # Flg E ALL F ALL G ALL H ALL *Grooved end not available DN32 Metric Dimensions- M.M -3-
4 Schematics The Mark 6127 consists of the following components, arranged as shown on the schematic diagram: 1. Main Valve: A hydraulically-operated, diaphragmactuated, globe or angle valve which closes with an elastomer-on-metal-seal. 2. Pressure Reducing Pilot: A two-way, normally open pilot valve which senses downstream pressure under its diaphragm and balances it against an adjustable spring load. An increase in downstream pressure tends to make the pilot close. 3. Ejector: A simple tee fitting with a fixed orifice in its upstream port. It provides the proper pressure to the diaphragm chamber of the main valve depending on the position of the pressure reducing pilot. 4. Flow Control Valve: A needle-type valve which provides adjustable, restricted flow in one direction and free flow in the opposite direction. On the Mark 6127, the flow control valve is connected as an opening speed control. 5. Y-Strainer (standard on water service valves): The strainer protects the pilot system from solid contaminants in the line fluid. 6A/B. Two Ball Valves (standard on water service valves, optional on fuel service valves): Useful for isolating the pilot system for maintenance or trouble shooting. -4-
5 Pilot Accurate sensing of outlet pressure Simple, single adjustment All parts replaceable while mounted on valve Rubber-to-metal seat for positive shut-off Large area diaphragm for quick, precise throttling Visual indication of diaphragm condition Bronze and stainless steel construction Pilot Materials Bronze B-62 Stainless Steel ASTM A743/CF8M Spring Ranges 5-30, 20-80, , psi Model 1340/ 2420 Pressure Reducing Pilot 1. Adjusting Screw Cover 2. Adjusting Screw 3. Spring 4. Diaphragm 5. Pressure Sense 6. Pilot Outlet 7. Pilot Inlet Pilot Materials Stainless Steel ASTM A743/CF8M Spring Ranges psi The Model 1340 & 2420 Pressure Reducing Pilot controls the amount of pressure in the upper chamber of the main valve (hence, the degree of opening or closing of the main valve). The downstream system pressure is sensed under the pilot to close, increasing the amount of pressure in the upper chamber of the main valve causing it to close a proportionate amount to maintain a constant discharge pressure. As the downstream pressure decreases, the pilot begins to open, allowing the pressure in the upper chamber of the main valve to decrease, causing the main valve to open. This is a constant modulating action compensating for any change in downstream system pressure. -5-
6 MK6127/0118 Sizing Considerations Procedure The following procedure takes both factors (flow rate/pressure drop) into account through the use of the flow efficent, or Cv. The theory is simple: for best results, a PRV should be sized to operate between 10% and 90% of its capacity, or in other words, between 10% and 90% of its wide open Cv. It is a four-step procedure: Step 1: Calculate Cv Minimum Q Minimum= Minimum anticpated flow, GPM S= specific gravity of fluid (water=1.0) P1= Inlet pressure at Q minimum, psi Ps= Desire outlet pressure, psi Step 2: Calculate Cv Maximum Q Max.= Maximum anticipated flow, GPM P2= Inlet Pressure at Q maximum, psi PS= Desired outlet pressure, psi Step 3: From the Cv chart on Page 2, find the size that includes both the Cv min. and Cv max. you have calculated in either the globe or angle valve column. Occasionally, the flow range is so wide that both the Cv min. and Cv max. will not fit in the proper range for any one size value. In such cases, a parallel valve installation, with a smaller value by passing around a larger one, should be given strong consideration. Step 4: From the chart on Page 2, check that the velocity (GPM) at the calculated Q max. does not exceed 25 ft/sec/ Mark Pressure Reducing Valve How to Order Your Valve When ordering, please provide: Series Number Valve Size Globe/ Pressure Class Threaded/ Flanged/ Grooved Trim Material Adjustment Range Pilot Options Special Needs/ Installation Requirements Jordan Valve, a division of Richards Industries 3170 Wasson Road Cincinnati, OH (f) info@richardsind.com
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