# DSHD Series - Heatless Modular Desiccant Air Dryers

## DRYERS - COMPRESSED AIR / DESICCANT COMPRESSED AIR DRYERS

DSHD Series Modular Desiccant Air Dryers are ideal for point of use, laboratories and confined areas. They provide a continuous supply of dry compressed air by automatically cycling the flow of air through two desiccant beds.

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#### Features

Deltech’s DSHD Series Modular Desiccant Air Dryers protect moisture sensitive applications requiring low pressure dew points. Delivers dew points of ISO 8573-1: 2010 Class 1 (-94°F, -70°C) and Class 2 (-40°F, -40°C) with flow rates of 7 to 40 scfm (12 to 68 nm3/h). Critical applications include labs, hospitals, pharmaceutical manufacturing and other high-tech installations.

The DSHD Series incorporate a time proven design, with superior features and reliability, in a compact and easy to install package. Standard features include:

#### Theory of Operation

Compressed air enters the dryer and is directed to Tower 1 by valve (A), and then to the dryer outlet through shuttle valve (B). A portion of the dried air is throttled to near atmospheric pressure by means of orifice (C). This extremely dry, low-pressure air flows through and regenerates the desiccant in Tower 2 and is exhausted through purge/repressurization valve (D) and exhaust muffler (E) to atmosphere. After a set time, the automatic solid state timer closes purge/repressurization valve (D) allowing Tower 2 to repressurize slowly. At the end of 2 minutes, valve (A) shifts and purge/ repressurization valve (D) reopens. The main air flow is now dried by Tower 2 while Tower 1 is being regenerated.

#### Specifications

### TABLE 1 - INLET & PURGE FLOWS @ 100 PSIG

Model | INLET FLOW RATING^{1}SCFM (NM ^{3}/H) |
PURGE FLOW^{2}SCFM (NM³/H) |
IN/OUT CONNECTIONS |
||||||
---|---|---|---|---|---|---|---|---|---|

-40°F | (-40°C) | -94°F | (-70°C) | Average | Maximum | IN | |||

DSHD-7 |
7 | 12 | 5 | 8 | 1.5 | 2.3 | 1.8 | 2.7 | 1/2" NPT |

DSHD-13 |
13 | 22 | 9 | 15 | 2.7 | 4.5 | 3.7 | 5.1 | 1/2" NPT |

DSHD-18 |
18 | 31 | 12 | 20 | 3.7 | 5.7 | 4.4 | 6.5 | 1/2" NPT |

DSHD-21 |
21 | 36 | 14 | 23.5 | 4.6 | 7.2 | 5.4 | 8.1 | 1/2" NPT |

DSHD-27 |
27 | 46 | 18 | 30.5 | 5.3 | 8.3 | 6.2 | 9.2 | 1/2" NPT |

DSHD-40 |
40 | 68 | 27 | 45.5 | 9.7 | 15 | 11.6 | 16.1 | 1/2" NPT |

^{1} Inlet flows are established in accordance with CAGI (Compressed Air and Gas Institute) standard ADF-200, Dual Stage Regenerative Desiccant Compressed Air Dryers - Methods for Testing and Rating. Conditions for rating dryers are: inlet pressure - 100 psig (7 kg/cm^{2}); inlet temperature - saturated at 100°F (38°C).

^{2} Average Purge Flow is the total amount of air used to purge and repressurize off-stream towers averaged over the cycle time. Maximum Purge Flow is the flow rate through the off-stream tower during that portion of the cycle the purge/ repressurization valve is open.

### TABLE 2 - INLET & PURGE FLOW CORRECTION FACTORS

INLET PRESSURE |
psig | 50 | 70 | 90 | 100 | 110 | 120 | 130 | 150 |
---|---|---|---|---|---|---|---|---|---|

kg/cm^{2} |
3.5 | 4.9 | 6.3 | 7 | 7.7 | 8.4 | 9.1 | 10.5 | |

MULTIPLIER A |
0.31 | 0.54 | 0.83 | 1.00 | 1.09 | 1.17 | 1.26 | 1.44 | |

MULTIPLIER B |
0.55 | 0.73 | 0.91 | 1.00 | 1.09 | 1.17 | 1.26 | 1.44 |

**CAPACITY CORRECTION FACTORS**

- To determine maximum inlet flow at inlet pressures other than 100 psig (7 kg/cm
^{2}), multiply inlet flow from Table 1 by multiplier A from Table 2 that corresponds to system pressure at inlet of dryer. - To determine purge flow at inlet pressures other than 100 psig (7 kg/cm
^{2}), multiply purge flow at 100 psig (7 kg/cm^{2}), from Table 1 by multiplier B from Table 2 that corresponds to system pressure at inlet of dryer. - To determine outlet flow capacity, subtract purge flow from inlet flow.

#### Dimensions

#### DSHD-7

MODEL | DIMENSIONS | WEIGHT | ||||||
---|---|---|---|---|---|---|---|---|

H | W | D | ||||||

IN | MM | IN | MM | IN | MM | LBS | KG | |

DSHD-7 |
19 | 494 | 14 | 346 | 7 | 168 | 77 | 35 |

#### DSHD-13

MODEL | DIMENSIONS | WEIGHT | ||||||
---|---|---|---|---|---|---|---|---|

H | W | D | ||||||

IN | MM | IN | MM | IN | MM | LBS | KG | |

DSHD-13 |
26 | 666 | 14 | 346 | 7 | 168 | 93 | 42 |

#### DSHD-18

MODEL | DIMENSIONS | WEIGHT | ||||||
---|---|---|---|---|---|---|---|---|

H | W | D | ||||||

IN | MM | IN | MM | IN | MM | LBS | KG | |

DSHD-18 |
35 | 884 | 14 | 346 | 7 | 168 | 112 | 51 |

#### DSHD-21

MODEL | DIMENSIONS | WEIGHT | ||||||
---|---|---|---|---|---|---|---|---|

H | W | D | ||||||

IN | MM | IN | MM | IN | MM | LBS | KG | |

DSHD-21 |
43 | 1101 | 14 | 346 | 7 | 168 | 132 | 60 |

#### DSHD-27

MODEL | DIMENSIONS | WEIGHT | ||||||
---|---|---|---|---|---|---|---|---|

H | W | D | ||||||

IN | MM | IN | MM | IN | MM | LBS | KG | |

DSHD-27 |
39 | 994 | 15 | 383 | 7 | 189 | 154 | 70 |

#### DSHD-40

MODEL | DIMENSIONS | WEIGHT | ||||||
---|---|---|---|---|---|---|---|---|

H | W | D | ||||||

IN | MM | IN | MM | IN | MM | LBS | KG | |

DSHD-40 |
49 | 1244 | 15 | 383 | 7 | 189 | 181 | 82 |

MODEL | DIMENSIONS | WEIGHT | ||||||
---|---|---|---|---|---|---|---|---|

H | W | D | ||||||

IN | MM | IN | MM | IN | MM | LBS | KG | |

DSHD-7 |
19 | 494 | 14 | 346 | 7 | 168 | 77 | 35 |

MODEL | DIMENSIONS | WEIGHT | ||||||
---|---|---|---|---|---|---|---|---|

H | W | D | ||||||

IN | MM | IN | MM | IN | MM | LBS | KG | |

DSHD-13 |
26 | 666 | 14 | 346 | 7 | 168 | 93 | 42 |

MODEL | DIMENSIONS | WEIGHT | ||||||
---|---|---|---|---|---|---|---|---|

H | W | D | ||||||

IN | MM | IN | MM | IN | MM | LBS | KG | |

DSHD-18 |
35 | 884 | 14 | 346 | 7 | 168 | 112 | 51 |

MODEL | DIMENSIONS | WEIGHT | ||||||
---|---|---|---|---|---|---|---|---|

H | W | D | ||||||

IN | MM | IN | MM | IN | MM | LBS | KG | |

DSHD-21 |
43 | 1101 | 14 | 346 | 7 | 168 | 132 | 60 |

MODEL | DIMENSIONS | WEIGHT | ||||||
---|---|---|---|---|---|---|---|---|

H | W | D | ||||||

IN | MM | IN | MM | IN | MM | LBS | KG | |

DSHD-27 |
39 | 994 | 15 | 383 | 7 | 189 | 154 | 70 |

MODEL | DIMENSIONS | WEIGHT | ||||||
---|---|---|---|---|---|---|---|---|

H | W | D | ||||||

IN | MM | IN | MM | IN | MM | LBS | KG | |

DSHD-40 |
49 | 1244 | 15 | 383 | 7 | 189 | 181 | 82 |

#### Downloads

Deltech’s DSHD Series Modular Desiccant Air Dryers protect moisture sensitive applications requiring low pressure dew points. Delivers dew points of ISO 8573-1: 2010 Class 1 (-94°F, -70°C) and Class 2 (-40°F, -40°C) with flow rates of 7 to 40 scfm (12 to 68 nm3/h). Critical applications include labs, hospitals, pharmaceutical manufacturing and other high-tech installations.

The DSHD Series incorporate a time proven design, with superior features and reliability, in a compact and easy to install package. Standard features include:

Compressed air enters the dryer and is directed to Tower 1 by valve (A), and then to the dryer outlet through shuttle valve (B). A portion of the dried air is throttled to near atmospheric pressure by means of orifice (C). This extremely dry, low-pressure air flows through and regenerates the desiccant in Tower 2 and is exhausted through purge/repressurization valve (D) and exhaust muffler (E) to atmosphere. After a set time, the automatic solid state timer closes purge/repressurization valve (D) allowing Tower 2 to repressurize slowly. At the end of 2 minutes, valve (A) shifts and purge/ repressurization valve (D) reopens. The main air flow is now dried by Tower 2 while Tower 1 is being regenerated.

### TABLE 1 - INLET & PURGE FLOWS @ 100 PSIG

Model | INLET FLOW RATING^{1}SCFM (NM ^{3}/H) |
PURGE FLOW^{2}SCFM (NM³/H) |
IN/OUT CONNECTIONS |
||||||
---|---|---|---|---|---|---|---|---|---|

-40°F | (-40°C) | -94°F | (-70°C) | Average | Maximum | IN | |||

DSHD-7 |
7 | 12 | 5 | 8 | 1.5 | 2.3 | 1.8 | 2.7 | 1/2" NPT |

DSHD-13 |
13 | 22 | 9 | 15 | 2.7 | 4.5 | 3.7 | 5.1 | 1/2" NPT |

DSHD-18 |
18 | 31 | 12 | 20 | 3.7 | 5.7 | 4.4 | 6.5 | 1/2" NPT |

DSHD-21 |
21 | 36 | 14 | 23.5 | 4.6 | 7.2 | 5.4 | 8.1 | 1/2" NPT |

DSHD-27 |
27 | 46 | 18 | 30.5 | 5.3 | 8.3 | 6.2 | 9.2 | 1/2" NPT |

DSHD-40 |
40 | 68 | 27 | 45.5 | 9.7 | 15 | 11.6 | 16.1 | 1/2" NPT |

^{1} Inlet flows are established in accordance with CAGI (Compressed Air and Gas Institute) standard ADF-200, Dual Stage Regenerative Desiccant Compressed Air Dryers - Methods for Testing and Rating. Conditions for rating dryers are: inlet pressure - 100 psig (7 kg/cm^{2}); inlet temperature - saturated at 100°F (38°C).

^{2} Average Purge Flow is the total amount of air used to purge and repressurize off-stream towers averaged over the cycle time. Maximum Purge Flow is the flow rate through the off-stream tower during that portion of the cycle the purge/ repressurization valve is open.

### TABLE 2 - INLET & PURGE FLOW CORRECTION FACTORS

INLET PRESSURE |
psig | 50 | 70 | 90 | 100 | 110 | 120 | 130 | 150 |
---|---|---|---|---|---|---|---|---|---|

kg/cm^{2} |
3.5 | 4.9 | 6.3 | 7 | 7.7 | 8.4 | 9.1 | 10.5 | |

MULTIPLIER A |
0.31 | 0.54 | 0.83 | 1.00 | 1.09 | 1.17 | 1.26 | 1.44 | |

MULTIPLIER B |
0.55 | 0.73 | 0.91 | 1.00 | 1.09 | 1.17 | 1.26 | 1.44 |

**CAPACITY CORRECTION FACTORS**

- To determine maximum inlet flow at inlet pressures other than 100 psig (7 kg/cm
^{2}), multiply inlet flow from Table 1 by multiplier A from Table 2 that corresponds to system pressure at inlet of dryer. - To determine purge flow at inlet pressures other than 100 psig (7 kg/cm
^{2}), multiply purge flow at 100 psig (7 kg/cm^{2}), from Table 1 by multiplier B from Table 2 that corresponds to system pressure at inlet of dryer. - To determine outlet flow capacity, subtract purge flow from inlet flow.

#### DSHD-7

MODEL | DIMENSIONS | WEIGHT | ||||||
---|---|---|---|---|---|---|---|---|

H | W | D | ||||||

IN | MM | IN | MM | IN | MM | LBS | KG | |

DSHD-7 |
19 | 494 | 14 | 346 | 7 | 168 | 77 | 35 |

#### DSHD-13

MODEL | DIMENSIONS | WEIGHT | ||||||
---|---|---|---|---|---|---|---|---|

H | W | D | ||||||

IN | MM | IN | MM | IN | MM | LBS | KG | |

DSHD-13 |
26 | 666 | 14 | 346 | 7 | 168 | 93 | 42 |

#### DSHD-18

MODEL | DIMENSIONS | WEIGHT | ||||||
---|---|---|---|---|---|---|---|---|

H | W | D | ||||||

IN | MM | IN | MM | IN | MM | LBS | KG | |

DSHD-18 |
35 | 884 | 14 | 346 | 7 | 168 | 112 | 51 |

#### DSHD-21

MODEL | DIMENSIONS | WEIGHT | ||||||
---|---|---|---|---|---|---|---|---|

H | W | D | ||||||

IN | MM | IN | MM | IN | MM | LBS | KG | |

DSHD-21 |
43 | 1101 | 14 | 346 | 7 | 168 | 132 | 60 |

#### DSHD-27

MODEL | DIMENSIONS | WEIGHT | ||||||
---|---|---|---|---|---|---|---|---|

H | W | D | ||||||

IN | MM | IN | MM | IN | MM | LBS | KG | |

DSHD-27 |
39 | 994 | 15 | 383 | 7 | 189 | 154 | 70 |

#### DSHD-40

MODEL | DIMENSIONS | WEIGHT | ||||||
---|---|---|---|---|---|---|---|---|

H | W | D | ||||||

IN | MM | IN | MM | IN | MM | LBS | KG | |

DSHD-40 |
49 | 1244 | 15 | 383 | 7 | 189 | 181 | 82 |

MODEL | DIMENSIONS | WEIGHT | ||||||
---|---|---|---|---|---|---|---|---|

H | W | D | ||||||

IN | MM | IN | MM | IN | MM | LBS | KG | |

DSHD-7 |
19 | 494 | 14 | 346 | 7 | 168 | 77 | 35 |

MODEL | DIMENSIONS | WEIGHT | ||||||
---|---|---|---|---|---|---|---|---|

H | W | D | ||||||

IN | MM | IN | MM | IN | MM | LBS | KG | |

DSHD-13 |
26 | 666 | 14 | 346 | 7 | 168 | 93 | 42 |

MODEL | DIMENSIONS | WEIGHT | ||||||
---|---|---|---|---|---|---|---|---|

H | W | D | ||||||

IN | MM | IN | MM | IN | MM | LBS | KG | |

DSHD-18 |
35 | 884 | 14 | 346 | 7 | 168 | 112 | 51 |

MODEL | DIMENSIONS | WEIGHT | ||||||
---|---|---|---|---|---|---|---|---|

H | W | D | ||||||

IN | MM | IN | MM | IN | MM | LBS | KG | |

DSHD-21 |
43 | 1101 | 14 | 346 | 7 | 168 | 132 | 60 |

MODEL | DIMENSIONS | WEIGHT | ||||||
---|---|---|---|---|---|---|---|---|

H | W | D | ||||||

IN | MM | IN | MM | IN | MM | LBS | KG | |

DSHD-27 |
39 | 994 | 15 | 383 | 7 | 189 | 154 | 70 |

MODEL | DIMENSIONS | WEIGHT | ||||||
---|---|---|---|---|---|---|---|---|

H | W | D | ||||||

IN | MM | IN | MM | IN | MM | LBS | KG | |

DSHD-40 |
49 | 1244 | 15 | 383 | 7 | 189 | 181 | 82 |