EMERSON VCIMD-15082 Spence Type NLD Free-Floating Lever Drainer Instruction Manual
- June 4, 2024
- Emerson
Table of Contents
EMERSON VCIMD-15082 Spence Type NLD Free-Floating Lever Drainer
WARNING
Failure to follow these instructions or to properly install and maintain this
equipment could result in property damage and personal injury or death. Type
NLD Free-Floating Lever Drainer must be installed, operated, and maintained in
accordance with federal, state, and local codes, rules, regulations, and
Emerson instructions. If the valve vents gas or a leak develops in the system,
service to the unit may be required. Failure to correct the issue could result
in a hazardous condition. Installation, operation, and maintenance procedures
performed by unqualified personnel may result in improper adjustment and
unsafe operation. Either condition may result in equipment damage or personal
injury. Only a qualified person shall install or service the Type NLD Free-
Floating Lever Drainer.
Introduction
Scope of the Manual
This manual provides instructions for the installation, troubleshooting,
maintenance and setting of Type NLD Free-Floating Lever Drainer.
Product Description
Type NLD free-floating lever drainer is a float type design with all stainless
steel components including, sealed body, seat and valve. It is available in
NPS 3/4 x 1/2 / DN 20 x 15 connections.
Principle of Operation
Type NLD removes liquids from a pressurized air/ gas system. The float and
lever-operated design provides instantaneous and automatic adjustment to
variations in flow and pressure. As liquid enters the top of the drainer, it
starts to lift the float up and open the valve. When the liquid is removed, it
falls back down to close the valve. This cycle repeats as more liquid
accummulates in the drainer.
Specifications
This section lists the specifications for the Type NLD. Factory specifications are stamped on the nameplate fastened on the drainer at the factory.
-
Available Configuration
Type NLD: Free-float liquid drainer -
Body Size
NPS 3/4 x 1/2 / DN 20 x 15 -
End Connection Style
NPT -
Orifice Size
1/8, 3/32 and 5/64 in. / 3.18, 2.38 and 1.98 mm -
Maximum Operating Pressure(1)
See Table 1 -
Maximum Allowable Pressure(1)
400 psig / 27.6 bar -
Maximum Allowable Temperature(1)
500°F / 260°C
Materials of Construction
Body, Connectors, Float, Lever and Bracket- Clip: 304 Stainless steel
- Valve and Valve Seat: Hardened chrome steel
-
Applications
Removes liquid from air or gas systems and storage
Table 1. Maximum Operating Pressure
| ORIFICE SIZE | MAXIMUM OPERATING PRESSURE |
|---|---|
| In. | mm |
| 1/8 | 3.18 |
| 3/32 | 2.38 |
| 5/64 | 1.98 |
Installation
WARNING
Personal injury, property damage, equipment damage or leakage due to escaping
steam or bursting of pressure-containing parts may result if this drainer is
over-pressured or is installed where service conditions could exceed the
limits given in the specifications or where conditions exceed any ratings of
the adjacent piping or piping connections. To avoid such injury or damage,
provide pressure-relieving or pressure-limiting devices (as required by the
appropriate code, regulation, or standard) to prevent service conditions from
exceeding those limits. To avoid personal injury or property damage from the
sudden release of pressure, isolate the drainer from the pressure system and
release all pressure and steam before performing maintenance operations.
CAUTION
Do not install Drainers with an open discharge where a malfunction could cause
damage.
- Properly locate Type NLD in the system.
- Do not exceed the maximum allowable pressure and temperature noted on the label of the Type NLD body. Also, check to see if the liquid drainer has the proper maximum differential pressure for your particular application.
- Locate Type NLD liquid drainer at the low points in air or gas service system, or on any gas storage or distribution system. Do not locate Type NLD below and close to the unit being drained or as directed by the equipment manufacturer.
- Adhere to good piping practices. Before installing the Type NLD, clean by flushing out the lines to remove loose dirt. A strainer in the line leading to the liquid drainer in recommended for dirty systems. Use pipe dope or piping tape sparingly and on external threads only. Leave the end thread exposed to avoid introducing sealant into the system.
5. Make sure that the Type NLD is mounted in the proper direction with the flow arrow on the body of the valve pointing down. This will allow the float mechanism to work properly.
6. When tightening a pipe into either the inlet or the outlet fittings of a Type NLD, use only the hex-shaped fittings as wrenching surfaces. Do not use the drainer body for a wrenching surface to screw the drainer into position.
7. The inlet and outlet piping should be the same size as the Type NLD’s connections. Do not reduce the size of the inlet on light loads; however, smaller pipe or tubing may be used on the outlet. Keep the piping as short as possible, with a minimum of valves and fittings. If you are installing a liquid drainer without an equalizing connection, try not to use elbows in the inlet line from the equipment to the liquid drainer.
8. Install gate valves or full ported ball valves (DO NOT USE GLOBE VALVES) so the drainer can be isolated from the system to permit servicing. If the drainer is installed in a closed piping arrangement, install Uniflex Union pipe couplings in each side of the drain trap.
Maintenance
To avoid personal injury or property damage from the sudden release of pressure, isolate the drainer from the pressure system before performing maintenance operations. The Type NLD is a maintenance-free valve, composed of corrosion-resistant stainless steel components and a tamper-proof, the sealed welded body which will resist freezing. No gaskets or adjustments are necessary.
- Type NLD does not discharge:
- Insufficient liquid coming to the drainer to permit discharge. Continue operation.
- Type NLD becomes filled with dirt or sludge – install strainer on inlet side, remove Type NLD from service, and replace with a new Type NLD.
- Differential pressure across Type NLD is too high – check inlet and outlet pressure. If the difference exceeds the maximum pressure stamped on the Type NLD, the drainer will remain closed. Reduce the differential pressure if possible, or install properly sized Type NLD.
- Dirt or scale develops on valve or seat – install strainer on inlet side, remove Type NLD from service, and replace with a new Type NLD.
- Type NLD discharges continuously:
- Drainer was sized too small for this application. Replace with a new correctly sized Type NLD.
- Abnormal amounts of liquid coming through Type NLD – replace with a new Type NLD that has a larger capacity and will handle peak loads.
- Worn valve or seat – as the seat becomes worn, the seating area enlarges. Remove the valve from the service and replace with new Type NLD.
- Inlet or outlet line valves closed – open valves.
- Stainer clogged – clean strainer screen.
- Collapsed float – replace with a new Type NLD.
Parts Ordering
Type NLD is a maintenance-free valve, when ordering replacement, contact your
local Sales Office.
VCIMD-15082 © 2021 Emerson Electric Co. All rights reserved. 11/21 Spence is a mark owned by one of the companies in the Emerson Automation Solutions business unit of Emerson Electric Co. The Emerson logo is a trademark and service mark of Emerson Electric Co. All other marks are property of their prospective owners. The contents of this publication are presented for informational purposes only, and while every effort has been made to ensure their accuracy, they are not to be construed as warranties or guarantees, express or implied, regarding the products or services described herein or their use or applicability. All sales are governed by our terms and conditions, which are available upon request. We reserve the right to modify or improve the designs or specifications of such products at any time without notice. Emerson Electric Co. does not assume responsibility for the selection, use or maintenance of any product. Responsibility for proper selection, use and maintenance of any Emerson Electric Co. product remains solely with the purchaser.
Emerson Automation Solutions
Americas
McKinney, Texas 75070 USA
T +1 800 558 5853
+1 972 548 3574
Europe
Bologna 40013, Italy
T +39 051 419 0611
Asia Pacific
Singapore 128461, Singapore
T +65 6777 8211
Middle East and Africa
Dubai, United Arab Emirates
T +971 4 811 8100
Read User Manual Online (PDF format)
Read User Manual Online (PDF format) >>