vacuum box with Arduino

#include <Wire.h>
#include <Adafruit_BMP085.h>

Adafruit_BMP085 bmp;
// VCC -> 3.3V
// GND -> GND
// SCL -> Analog 5
// SDA -> Analog 4

int pushButton = 8;
int valve = 7;
int pump = 6;

double vacuum = 960.0; //at this pressure we got vacuum
double safety = 20.0;  //safety range for pressure


void setup() {

  pinMode(pushButton, INPUT);
  pinMode(valve, OUTPUT);
  pinMode(pump, OUTPUT);
  Serial.begin(9600);
  if (!bmp.begin()) {
    Serial.println("Could not find a valid BMP085 sensor, check wiring!");
    while (1) {}
  }
}

void loop() {
    Serial.print("Temperature = ");
    Serial.print(bmp.readTemperature());
    Serial.println(" *C");

    double pressure = (bmp.readPressure()/100); //hPa
    Serial.print("Pressure = ");
    Serial.print(pressure);
    Serial.println(" Pa");

    if (digitalRead(pushButton) == HIGH) {
      digitalWrite(valve, HIGH);
      digitalWrite(pump, HIGH);
      while (pressure > vacuum && digitalRead(pushButton) == HIGH) {
        pressure = (bmp.readPressure()/100)+safety; //we will actually get to (960-20)=940 hPa before stopping
        Serial.print("Pressure = ");
        Serial.print(pressure);
        Serial.println(" Pa");
        delay(1000);
      }
      Serial.println("Stop");
      digitalWrite(valve, LOW);
      digitalWrite(pump, LOW);
    } else {
      digitalWrite(pump, LOW);
      digitalWrite(valve, HIGH);
    }

    delay(5000);
}