Normally closed valve for dry pipe trim on a diaphragm valve

A fire suppression system comprising:

• a control valve coupled with piping;
• an actuator coupled with the control valve;
• and
• a valve assembly coupled with the control valve, the actuator, and the piping and comprising:
• a body comprising:
• a first section defining a first opening having a larger diameter portion structured to receive a portion of a conduit fluidly coupled with the control valve and a smaller diameter portion inward from the larger diameter portion;
• a second section defining a chamber, a second opening, and a pressure port coupled with an inlet of the control valve;
• and
• a third section defining a third opening and a release port fluidly coupled with an inlet of the actuator, the second section between the first section and the third section;
• a spring positioned within the third opening;
• a spacer positioned within the third opening and coupled with the spring;
• an interfacing member positioned partially within the third opening and coupled with the spacer;
• a connecting rod positioned partially within the second opening and the chamber and coupled with the interfacing member;
• and
• a plunger positioned within the chamber and coupled with the connecting rod, the spring to bias the plunger to a first state in which the first opening is sealed from the chamber, the plunger to change from the first state to a second state to control fluid flow through the body, the plunger configured to move to the second state, in which the first opening is open to the chamber, based on a first force exerted on the plunger by a fluid received through the pressure port being greater than a second force exerted by the spring on the plunger.