Overview of Primary Product

ManualsBrandsSiemens Manuals656 Series Globe Valves656 Powermite Repack Kit (Pack of 6)

Siemens Industry, Inc.

Powers™ Controls

Technical Instructions

Document No. 155-311P25

VP 656-5

March 7, 2005

Powermite Two-Way Flared

Valves

Normally Open/Normally

Closed

Description

The VP 656 normally open and normally closed flared valves are pneumatically

operated valves designed to control the flow of both water and steam.

Features

• Enclosed actuator housing to protect the diaphragm, spring, etc.

• Small size allows installation in restricted space

• Replaceable soft disc provides tight shut-off actuator can be rotated to facilitate air

connection

• Stainless steel valve stem to reduce friction and corrosion

Application

The VP 656 flared valves are recommended for control of hot or chilled water and

steam for convectors, fan coil units, radiation, reheat coils and similar terminal unit

applications. The dual seating packed construction allow its use in systems having

relatively high pressures.

Typical uses are sites where efficient economical control is desired. The small overall

size lends itself to installation within a cabinet enclosure where available space is

limited.

Product Numbers

Table 1.

Action Valve Size Cv (Kvs) Product Number

Normally Open

1/2-inch (15 mm) 0.9 (0.77) 656-0004

1/2-inch (15 mm) 2.1 (1.8) 656-0002

Normally Closed 1/2-inch (15 mm) 2.1 (1.8) 656-0012

Specifications

Line size 1/2-inch (15 mm)

Capacity See Tables 2 through 5.

Body style Globe-flared

Action Normally Closed (NC)

Normally Open (NO)

Summary of content (7 pages)

PAGE 1
Technical Instructions Document No. 155-311P25 VP 656-5 March 7, 2005 Powers™ Controls Powermite Two-Way Flared Valves Normally Open/Normally Closed Description The VP 656 normally open and normally closed flared valves are pneumatically operated valves designed to control the flow of both water and steam. Features • Enclosed actuator housing to protect the diaphragm, spring, etc.
PAGE 2
Technical Instructions Document No. 155-311P25 March 7, 2005 Powermite Two-Way Flared Valves Normally Open/Normally Closed Specifications, Con’t Stem travel Valve body rating 1/4-inch (6.3 mm) ANSI 250. See Table 6. Material Body and seat Stem Packing Bronze Stainless steel EP rubber quad ring Operating Controlled medium Water, steam, ethylene glycol solution Maximum medium temperature 250°F (121°C) Maximum medium inlet pressure Water See Table 6.
PAGE 3
Powermite Two-Way Flared Valves Normally Open/Normally Closed Technical Instructions 155-311P25 March 7, 2005 Table 2. Maximum Water Capacity - U.S. Gallons per Minute. Valve Size Pressure Differential - psi in Cv\1 inches 1/2 2 3 4 5 6 8 10 12 14 15 16 17 18 19 20 0.9 1.3 1.6 1.78 2 2.2 2.5 2.8 3.1 3.4 3.5 3.6 3.7 3.8 3.9 4.0 2.1 3 3.6 4.2 4.7 5.1 5.9 6.6 7.3 7.9 8.1 8.4 8.7 8.9 9.2 9.4 Table 3. Maximum Water Capacity - Cubic Meters per Hour (m3/h).
PAGE 4
Technical Instructions Document No. 155-311P25 March 7, 2005 Powermite Two-Way Flared Valves Normally Open/Normally Closed Normally Open Normally Closed Figure 1. Nominal Close-off Ratings. Operation The actuator spring provides the necessary force to hold the stem in the raised or normal position. An increase in control pressure overcomes the spring pressure and moves the stem downward. In a normally closed valve, this increases the flow of fluid through the valve.
PAGE 5
Powermite Two-Way Flared Valves Normally Open/Normally Closed Installation Technical Instructions 155-311P25 March 7, 2005 In concealed installations, allow 2 inches (50 mm) from the top of the actuator to remove the upper housing for valve servicing. Install all valves so that the flow is directed under the valve seat. Flow direction arrows are cast on the valve body. Never use the valve housing as a lever arm to tighten the body when taking up on a thread.
PAGE 6
Technical Instructions Document No. 155-311P25 March 7, 2005 Powermite Two-Way Flared Valves Normally Open/Normally Closed Table 8. Valve Assembly Parts and Service Kits. See Figures 4 and 5. Normally Open Item Description Kit Item Number Q’ty Material Items 29 and 31 Kits 1 Phos. Bronze Item 31 Kit 1 Brass 1 Steel 4 Steel 1 Aluminum Item 31 Kit 1 Stainless Steel Cv 0.9 Cv 2.
PAGE 7
Powermite Two-Way Flared Valves Normally Open/Normally Closed Technical Instructions 155-311P25 March 7, 2005 Parts of the Valve Assembly Figure 4. Normally Open. See Table 8. Figure 5. Normally Closed. See Table 8. Information in this publication is based on current specifications. The company reserves the right to make changes in specifications and models as design improvements are introduced. Powers is a registered trademark of Siemens Industry, Inc.