March 2011 / BULLETIN 90-40 Discharge Bypass Valves for System Capacity Control
TABLE OF CONTENTS ADRHE-6 ADRI DRHE-6 SHGB-8 SHGB-15 System Capacity Control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1 Application . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1 Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4 Direct Acting Valves – ADRI, ADRS, ADRP, ADRH . . . . . . . . . . . . . . . . . . . . . . . . . . . .
BULLETIN 90-40 / Page 1 On many air conditioning and refrigeration systems it is desirable to limit the minimum evaporating pressure during periods of low load either to prevent coil icing or to avoid operating the compressor at a lower suction pressure than it was designed to operate. Various methods have been used to achieve this result — integral cylinder unloading, gas engines with variable speed control, or multiple smaller systems.
Some caution is necessary with either of these methods. If the distributor circuits are sized properly for normal cooling duty, the flow of hot gas through the circuits may cause excessive pressure drop and/or noise. Therefore, it is recommended that the distributor circuits be selected one size larger than for straight cooling duty. See Selection Procedures Section for selection information on this method of hot gas bypass.
gas at or below 65°F. For applications requiring suction gas temperatures appreciably below 65°F, contact Sporlan Valve Company or the compressor manufacturer for assistance. In all cases the maximum permis- sible suction gas temperature published by the compressor manufacturer must be followed. These spe- cial charges, along with the correct selection methods, are given in the Selection Procedures Section. Figure 3 illustrates an externally equalized desuperheating TEV.
Page 4 / BULLETIN 90-40 experiences a malfunction of the thermostatic expansion valve, which is serving to desuperheat the bypassed hot gas; or, if the system is short of refrigerant. The hot gas solenoid valve is wired in series with a bi-metal thermostat fastened to the discharge line close to the compressor. This causes the solenoid valve to close if the discharge line temperature becomes excessive. Complete selection information is given in the Selection Procedures Section.
BULLETIN 90-40 / Page 5 Figure 5 Solenoid Coil Energized Valve Modulating P1 P3 Ps P2 Figure 6 pilot valve, the pilot port modulates closed. This allows pressure to build on top of the main piston. As this pressure (P3) approaches the inlet pressure (P2), the force, combined with the force from the spring (P4), pushes the piston down, modulating the valve closed.
Page 6 / BULLETIN 90-40 The 0/30 range on the ADRS(E), ADRP(E) and ADRHE models is intended primarily for refrigeration applications, while the 0/80 range is generally required for air conditioning systems. The capacity table shows the evaporating temperatures at which each range can be applied. Where capacities are given for both the 0/30 and 0/80, the 0/30 psig range should be used because of its greater capacity.
BULLETIN 90-40 / Page 7 required. However prior to 1994, the element was integral and is not replaceable. In this case, the entire valve must be replaced. conditions only. However, special adjustment ranges will be considered on special order. Contact your Sporlan Representative or Sporlan, Washington, Missouri. The adjustable “remote bulb” elements contain a charge of dry air as the operating pressure. The adjustability feature is a valve assembly built into the remote bulb.
Page 8 / BULLETIN 90-40 PILOT OPERATED VALVES – SPECIFICATIONS and DIMENSIONS VALVE TYPES PORT SIZE ADJUSTMENT Inches RANGE – psi SHGB-8 SHGBE-8 0.43 0/100 SHGB-15 SHGBE-15 1 0/75 CONNECTIONS EXTERNAL NET WEIGHT SHIPPING WEIGHT BODY SEATING SOCKET ODF COPPER EQUALIZER COIL with Coil with Coil MATERIAL MATERIAL DEPTH Inches SAE – pounds – pounds .75 7/8 x 7/8 1/4" MKC-1 3.3 3.8 Brass 1-1/8 x 1-1/8 .91 Synthetic to Metal 1-1/8 INLET 1-1/8 OUTLET .91 5.75 6.
BULLETIN 90-40 / Page 9 SELECTION PROCEDURES The selection of a discharge bypass valve, and the necessary companion devices, is simplified if complete system information is available. This will result in the most economical selection because the components will match the system requirements.
Page 10 / BULLETIN 90-40 DIRECT ACTING DISCHARGE BYPASS VALVE CAPACITIES – Tons Capacities based on discharge temperatures 50°F above isentropic compression, 25°F superheat at the compressor, 10°F subcooling, and includes both the hot gas bypassed and liquid refrigerant for desuperheating, regardless of whether the liquid is fed through the system thermostatic expansion valves or an auxiliary desuperheating thermostatic expansion valve.
BULLETIN 90-40 / Page 11 ADJUSTABLE "REMOTE BULB" DISCHARGE BYPASS VALVE CAPACITIES – Tons Capacities based on discharge temperatures 50°F above isentropic compression, 25°F superheat at the compressor, 10°F subcooling, and includes both the hot gas bypassed and liquid refrigerant for desuperheating, regardless of whether the liquid is fed through the system thermostatic expansion valves or an auxiliary desuperheating thermostatic expansion valve.
Page 12 / BULLETIN 90-40 HOT GAS SOLENOID VALVES The selection of a Sporlan Hot Gas Solenoid Valve involves some of the same basic items already determined for the selection of the discharge bypass valve plus one additional factor: 1. Refrigerant. 2. Minimum allowable evaporating temperature at the reduced load condition. 3. Hot gas bypass requirement in tons - this is not the bypass valve capacity. 4.
BULLETIN 90-40 / Page 13 DESUPERHEATING THERMOSTATIC EXPANSION VALVES The proper selection procedure for a Sporlan Desuperheating TEV involves some of the same items already determined for the selection of the discharge bypass valve plus one additional item: 1. Refrigerant. 2. Minimum allowable evaporating temperature at the reduced load condition. 3. Hot gas bypass requirement in tons - this is not the bypass valve capacity. 4.
Page 14 / BULLETIN 90-40 DISTRIBUTOR WITH AUXILIARY SIDE CONNECTION OR AUXILIARY SIDE CONNECTOR (ASC) – Many times the distributor with an auxiliary side connection (Series 1650R) is selected and installed by the original equipment manufacturer. When it is applied in the field, its selection depends on the system’s main thermostatic expansion valve and the evaporator coil. This is discussed in the Application Section. The ASC is normally selected and applied in the field.
BULLETIN 90-40 / Page 15 DESUPERHEATING THERMOSTATIC EXPANSION VALVE CAPACITIES – Tons VALVE TYPE INTERNALLY EQUALIZED SAE ODF GS-1/8 GS-1/6 GS-1/4 GS-1/2 GS-1 GS-1-1/2 CS-2 CS-3 CS-4 – – EGS-1/8 EGS-1/6 EGS-1/4 EGS-1/2 EGS-1 EGS-1-1/2 SS-2 SS-3 SS-4 SS-6 – GN-1/5 GN-1/3 GN-1/2 GN-3/4 GN-1 GN-1-1/2 CN-2 CN-3 CN-4 CN-5 – EGN-1/5 EGN-1/3 EGN-1/2 EGN-3/4 EGN-1 EGN-1-1/2 SN-2 SN-3 SN-4 SN-5 – GP-1/8 GP-1/6 GP-1/4 GP-1/2 GP-1 GP-1-1/2 CP-2 CP-3 CP-4 – – EGP-1/8 EGP-1/6 EGP-1/4 EGP-1/2 EGP-1 EGP-1-1/2 SP-2 S
Page 16 / BULLETIN 90-40 LIQUID LINE SOLENOID VALVE CAPACITY SELECTION TABLE TYPE NUMBER "E" SERIES EXTENDED "A" and "B" SERIES CONNECTIONS WITH MANUAL LIFT STEM NORMALLY CLOSED A3P1 A3F1 A3S1 A3S1 – – – – – – – – – – – – – – – – MB6P1 MB6F1 MB6S1 MB6S1 MB9P2 MB9F2 – MB9S2 – – E3S120 E3S130 E5S120 E5S130 – – – – – – – – – – – – – – – – ME6S130 ME6S140 – – ME9S230 ME9S240 A3P1 A3F1 A3S1 A3S1 – – – – – – – – – – – – – – – – MB6P1 MB6F1 MB6S1 MB6S1 MB9P2 MB9F2 – MB9S2 – – E3S120 E3S130 E5S120 E5S130 – –
BULLETIN 90-40 / Page 17 OFFER OF SALE The items described in this document and other documents and descriptions provided by Parker Hannifin Corporation, its subsidiaries and its authorized distributors (“Seller”) are hereby offered for sale at prices to be established by Seller. This offer and its acceptance by any customer (“Buyer”) shall be governed by all of the following Terms and Conditions.
7 2011 Parker Hannifin Corporation 2011 Bulletin 90-40 Parker Hannifin Corporation Sporlan Di)ision 20 ange rive 5 ashington, MO 090 phone 2 9 1111 5 fax 2 9 91 0 www.sporlan.
